This 130-location professional services franchise was making budget decisions based on last-click attribution, which credited 72% of conversions to Google branded search. When we implemented multi-touch attribution with offline conversion tracking, the true picture emerged: social media and CTV campaigns that appeared to generate zero ROI in last-click models were actually responsible for introducing 40% of customers to the brand. This insight led to a budget reallocation that improved overall system ROI by 45%.
The Attribution Blind Spot
Under last-click attribution: Google branded search received 72% of conversion credit. Google non-branded search received 18%. Facebook/Instagram received 8%. CTV, programmatic display, and email received 2% combined. The franchise was considering eliminating CTV and reducing social media budgets based on this data. But a customer survey revealed that 60% of new customers first learned about the franchise through social media, CTV, or word of mouth driven by social content. Last-click attribution was dramatically overvaluing brand search (which captured demand) and undervaluing channels that created demand.
Implementing Multi-Touch Attribution
We deployed a multi-touch attribution system with three components. Component 1: Data-Driven Attribution in GA4, which uses machine learning to distribute conversion credit across touchpoints based on actual conversion patterns. Component 2: Offline Conversion Import, connecting POS data back to Google Ads and Meta Ads to attribute in-store purchases to preceding ad interactions. Component 3: Incrementality Testing, running geo-holdout experiments that measured the true causal impact of each channel by comparing markets with and without specific advertising.
Results: 45% ROI Improvement Through Reallocation
The multi-touch attribution model revealed true channel contribution: Google branded search dropped from 72% to 28% of conversion credit (still important, but not the whole story). Social media increased from 8% to 31% of conversion credit. CTV increased from 1% to 12% of conversion credit. Non-branded search remained stable at 19%. Based on these insights, we reallocated budget: reduced branded search spend by 30% (still captured demand at lower cost), increased social spend by 40%, maintained CTV investment, and increased non-branded search by 15%. The result: system-wide marketing ROI improved 45% within 6 months because budget was finally aligned with true channel contribution.
Key Takeaways
- Last-click attribution credited 72% to branded search, masking true channel value
- Multi-touch attribution revealed social media drove 31% of conversions, not 8%
- Geo-holdout incrementality tests measured the true causal impact of CTV and social
- Budget reallocation based on true attribution improved system ROI by 45%
- Offline conversion import connected in-store purchases to preceding digital interactions
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