Why Stock Low-Margin Products at All?
The obvious question: if a product has a 12% margin, why stock it? The answer is that margin percentage is not the only measure of a product's value to the business.
Anchor Pricing
A low-margin entry-level product makes your mid-range and premium products look better value by comparison. The presence of a £25 option makes the £45 option feel like a reasonable upgrade. Remove the £25 product and some customers who would have bought the £45 option now don't convert at all.
Traffic Generation and Range Completion
Some products attract high search volume that brings customers into your site — where they also browse and buy higher-margin items. A low-margin search magnet product that drives 40% of category traffic, with 20% of those visitors buying something else at higher margin, may be net-positive despite its own thin margins.
Cross-Sell Adjacencies
A low-margin printer generates ongoing high-margin ink cartridge sales. A low-margin razor drives high-margin blade subscription revenue. The first purchase is a loss-leader for a profitable long-term relationship. This is valid if LTV data supports the strategy.
Category Credibility
A full product range builds category credibility and improves overall conversion rates. A fashion brand that only stocks premium items misses customers who need to justify an entry-level purchase first before committing to premium items later.
Strategic Intent Required
Stocking a low-margin product without a clear strategic rationale is just carrying an underperforming SKU. Every low-margin product should have a defined role: anchor, traffic driver, cross-sell gateway, or loss-leader for a known follow-on purchase pattern.
When to Stop Advertising Low-Margin Products
Removing a low-margin product from paid Shopping campaigns is not the same as delisting it entirely. The right approach is often to maintain organic visibility while reducing or eliminating paid spend.
Stop advertising when:
- The product can't achieve break-even ROAS at any feasible bid level. If the category is so competitive that minimum bids to achieve any impression share exceed your break-even, advertising is a guaranteed loss.
- No measurable cross-sell value. If analytics shows no correlation between this product's sales and subsequent higher-margin purchases, the strategic case evaporates.
- Better uses for the budget exist. Every pound spent on a 12% margin product is a pound not spent on a 45% margin product. Opportunity cost is real.
- The product has consistently negative contribution after advertising. If COGS + fulfillment + payment fees + ad spend per sale consistently exceeds revenue, this product is destroying value at every sale.
| Gross Margin | Break-Even ROAS | Realistic in Shopping? | Recommendation |
|---|---|---|---|
| Below 10% | 10×+ | Almost never | Organic only; remove from paid |
| 10–15% | 6.7–10× | Rarely | Organic only unless niche/low competition |
| 15–20% | 5–6.7× | Possible in low-competition niches | Very conservative bid; monitor closely |
| 20–30% | 3.3–5× | Yes, with efficient bids | Margin-based bids; monitor ROAS weekly |
| 30%+ | Below 3.3× | Yes | Full profit-based bidding |
Contribution Margin Thinking for Product Mix
The key question isn't "what is this product's margin?" but "does advertising this product contribute net positive to our total profit?"
Contribution Margin Analysis: Low-Margin Product
Product: USB cable, £8.99 sale price, 18% gross margin = £1.62 gross profit
Fulfillment: £2.20. Payment processing: £0.56. Return allowance: £0.10
Contribution margin: −£1.24 per unit (already negative before advertising)
This product should not be advertised — it loses money on every order even without any ad spend. It can exist in the catalogue for convenience but should generate revenue only through organic search traffic, cart additions, or cross-sell.
Contrast: Marginal But Viable
Product: Notebook, £12.99, 22% gross margin = £2.86 gross profit
Fulfillment: £2.80. Payment processing: £0.68. Return allowance: £0.15
Contribution margin: −£0.77 (negative but close to break-even)
At very low CPC (under £0.08), this product could be breakeven. In practice, this means organic-only in most categories. However, if it's a gateway product with known cross-sell to £45 branded pens (40% margin), the customer LTV justifies the small first-order loss.
Reducing COGS on Low-Margin Lines
If a product plays a strategic role but has unacceptable margins, the first question is whether COGS can be reduced sufficiently to make it viable.
Private Label
If the low-margin product is a commodity (e.g. basic USB cables, plain notebooks, unbranded accessories), moving to own-brand can improve margin by 20–40 percentage points. The COGS reduction is significant because you're cutting out the branded premium.
Minimum Order Quantity Optimisation
Many suppliers offer meaningful price breaks at higher MOQs. If a product turns over 500+ units monthly, increasing order frequency to reduce per-unit cost by 8–12% can move a marginal product into viable territory.
Packaging Reduction
For very low-price products, packaging can represent 15–25% of effective COGS. Simplifying packaging (polybag vs box, for example) for basic commodity items maintains margins without compromising product quality.
Pricing Adjustments to Improve Low-Margin Products
Before accepting that a product has a permanently low margin, test whether a price increase is possible. Many brands underprice commodity items because competitors do — but if demand is inelastic, a price increase improves margin without reducing volume.
A controlled test: increase price by 10% on a low-margin product for 4 weeks. If conversion rate drops less than 10%, the price increase improved total gross profit. If conversion drops more than 10%, revert and accept the current pricing.
Price at Your Level, Not Your Competitors'
Many brands price-match competitors by default without testing whether their own customers are price-sensitive at that level. Own-brand or differentiated products often have more pricing power than their owners assume. Test before accepting low-margin positioning.
GROW Platform's Automatic Margin-Based Bid Adjustment
One of the most practical benefits of profit-based bidding is that it naturally limits spend on low-margin products without requiring manual exclusion rules or campaign restructuring.
Here's how it works:
- GROW's MarginStack stores the true margin for every SKU, including low-margin products
- ProfitClarity calculates a target ROAS for each product based on its margin and your profit target
- Low-margin products get very high ROAS targets (e.g. 8× for a 12% margin product aiming for a conservative profit)
- This high target means the product only bids when CPC is very low — it naturally "self-limits" in competitive auctions
- High-margin products get lower, more competitive ROAS targets and win more auctions
The result: budget automatically flows toward your most profitable products without any manual management. Low-margin products stay in your campaigns for organic Shopping coverage but consume minimal paid budget — exactly the right balance.
Frequently Asked Questions
Why would you stock low-margin products at all?
Low-margin products can play important strategic roles: anchor pricing (making premium products look better value by comparison), traffic generation (attracting shoppers who also buy high-margin items), category completion (providing a full range that improves conversion across the catalogue), and cross-sell adjacencies.
When should you stop advertising low-margin products?
Stop advertising when: the product cannot achieve break-even ROAS at any realistic bid level, the product has no meaningful cross-sell or anchor value, or the product consistently consumes budget that could generate higher ROI on better-margin products. Remove from campaigns but keep organic listings.
What is contribution margin thinking for product decisions?
Contribution margin thinking asks: does this product contribute positively to covering fixed costs and profit after all variable costs? A product with a 12% margin still contributes £12 on a £100 sale toward overheads — if it doesn't require expensive advertising, that contribution is valuable.
How can I improve margin on low-margin products?
Options: reduce COGS through supplier negotiation or private labelling, increase prices (test with small price changes first), reduce fulfillment costs by improving packaging efficiency, or use the product as an upsell from higher-margin primary products rather than advertising it independently.
How does GROW Platform handle low-margin products automatically?
GROW's ProfitClarity assigns each product a ROAS target based on its margin data. Low-margin products automatically receive very conservative ROAS targets — meaning they only win Shopping auctions at low cost-per-click. This naturally limits spend on low-margin products without requiring manual exclusion rules.
Next Steps
Audit your low-margin products: identify which have genuine strategic value, which can be improved through pricing or COGS work, and which should be moved to organic-only. Then let margin-based bidding handle the rest automatically.
Let GROW Manage Low-Margin Products Automatically
With GROW's profit-based bidding, low-margin products are automatically constrained in their spending — no manual exclusion rules needed. Budget flows to your most profitable products by default. Create an account to get started →
