Checklist Guide
Common Ecommerce Profit Leaks
Paid Media Edition
Your dashboards look fine. ROAS is hitting target. But somehow, the bank account tells a different story. This guide identifies the most common places money disappears in paid media-invisible in platform reporting, but painfully visible in your P&L.
Returns Eating Into Reported Revenue
High in fashion, footwear, homeware
Your dashboard shows £100k revenue, but £35k comes back as returns. That 4x ROAS becomes 2.6x after accounting for the real numbers.
Diagnostic Checklist
- Track net revenue (post-returns) alongside gross
- Calculate return rates by product, variant, and campaign
- Identify high-return products driving volume but destroying margin
- Adjust ROAS targets based on category return rates
BNPL Cash Flow Distortion
Growing problem across all sectors
Buy Now Pay Later inflates AOV in reporting but cash arrives in instalments. Defaults, chargebacks, and fees aren't captured in ad platform data.
Diagnostic Checklist
- Track BNPL vs non-BNPL conversion rates separately
- Monitor default rates by acquisition channel
- Account for BNPL fees in margin calculations
- Consider cash collection timeline in efficiency metrics
Variant Sprawl Fragmenting Spend
Severe in fashion, multi-variant products
Too many SKUs mean spend is spread thin. Low-volume variants lack conversion data, triggering poor bidding decisions and wasted budget.
Diagnostic Checklist
- Audit products with <10 clicks per month
- Identify variants consuming budget with zero conversions
- Consolidate or exclude underperforming variants
- Review custom label strategy in feed
Automated Bidding Bias
Universal across automated accounts
Smart bidding optimises for easy wins-often brand terms and retargeting. Incremental acquisition suffers while CAC looks fine on paper.
Diagnostic Checklist
- Segment brand vs non-brand performance separately
- Measure new customer acquisition specifically
- Review Performance Max placement reports
- Test manual control on high-value segments
Blended Attribution Lies
Especially problematic with multiple channels
Multi-touch attribution promises clarity but often redistributes credit randomly. Meanwhile, each platform over-claims, and the total exceeds reality.
Diagnostic Checklist
- Compare platform-reported revenue to actual bank deposits
- Run holdout tests on key channels
- Calculate Marketing Efficiency Ratio (total revenue ÷ total spend)
- Be skeptical of any single platform's claims
Hidden Fulfilment Costs
Chronic issue in competitive niches
That free shipping offer raised conversion rate but destroyed margin. Expedited shipping for sale items compounds the damage.
Diagnostic Checklist
- Calculate true cost per order including all logistics
- Model profitability impact of shipping thresholds
- Segment campaigns by shipping cost tier
- Exclude or reduce bids on heavy/expensive-to-ship items
The Pattern
Every profit leak here shares a common trait: it's invisible in ad platform reporting. Google doesn't know about your returns. Meta doesn't see your fulfilment costs. Neither cares about your cash flow.
The fix isn't a new platform or tool. It's building a measurement layer that connects advertising activity to commercial reality-and auditing regularly for these leaks.