The Seven Profit Leaks Killing Your Google Ads Account
These are the tactical failure modes we see repeatedly in UK DTC Shopping accounts. They kill businesses quietly while dashboards stay green. Standard ROAS reporting ignores all of them.
Leak 1: Feed Pollution
Symptom: Irrelevant queries, low CTR
Google does not understand what you sell. Poor data quality confuses bidding algorithms and attracts the wrong traffic.
The Fix:
- • Title Rewrite: Brand + Core Keyword + Variant + Attributes
- • Taxonomy: Deepen product_type to 3-5 levels
- • Negatives: Aggressive exclusion lists from search terms
Leak 2: SKU Role Mixing
Symptom: Fake stability, budget fights
Blended metrics look fine but growth is stalled. Mixing high and low margin goals in one campaign corrupts bidding signals for both.
The Fix:
- • Segment: Split Profit, Acquisition, and Clearance via Custom Labels
- • Targets: Set role-specific targets (tROAS vs Max Conversions)
- • Structure: Stop blending targets across diverse products
Leak 3: Contribution Blindness
Symptom: High ROAS, low cash
Scaling winners that actually lose money. Optimising for revenue instead of gross profit. Selling £100 of goods with £95 costs is not success; it is churn.
The Fix:
- • Metric Shift: Optimise to Contribution Margin (POAS)
- • Exclusions: Negative-list low-margin SKUs from high-cost ads
- • Values: Use margin-based conversion values in feed
Leak 4: Stock Misalignment
Symptom: Scaling into stockouts
Paying for clicks to out-of-stock pages. Velocity outpacing supply chain reality. You are paying to create a stockout.
The Fix:
- • Thresholds: Pause ads automatically if stock < 5 units
- • Filters: Use "in stock only" inventory filters
- • Substitutes: Redirect budget to similar in-stock items
Leak 5: Cash Timing Ignorance
Symptom: Card crunch despite profit
Revenue looks good but bank balance is dropping. Spending today on sales that take 60-90 days to convert to cash.
The Fix:
- • Enforce payback caps (e.g., "Must break even by Day 30")
- • Pivot budget to high-velocity SKUs with faster cash cycles
- • Secure inventory financing before pushing scale further
Leak 6: Cannibalisation
Symptom: Paid up, total flat
Extra spend targets users who would have bought anyway through branded search or retargeting. You are paying for traffic you already owned.
The Fix:
- • Implement geo-holdout tests to measure true lift
- • Cap Brand Search impression share or bid down
- • Strictly separate Brand vs Non-Brand budgeting
Leak 7: Incrementality Delusion
Symptom: Platform ROAS fantasy
Google Ads reports millions in revenue, but Shopify backend does not show the growth. Attribution theft: taking credit for view-throughs and newsletter conversions.
The Fix:
- • Triangulate with MER (Marketing Efficiency Ratio)
- • Ignore view-through conversions for budget allocation
- • Run "dark" periods or lift tests to calibrate targets
Plugging the Leaks
Most accounts have multiple leaks running simultaneously. The compounding effect is why a 5x ROAS account can drain cash faster than a 3x ROAS account with better fundamentals.
"Fix the leaks before increasing the flow. More budget into a leaky system just drains faster."
Start with the biggest leak. Usually that is contribution blindness (Leak 3) or SKU role mixing (Leak 2). Fix those before worrying about incrementality measurement.