Most ecom brands are measuring Meta ROAS wrong and cutting profitable campaigns
Running $30k+/month on Meta and making kill/scale decisions based on platform ROAS? You're probably cutting profitable campaigns.
Here's the problem: iOS14 attribution gaps mean Meta only captures 40-60% of actual conversions. In-platform ROAS will always look lower than reality.
The fix is blended MER (Marketing Efficiency Ratio):
Total Shopify Revenue / Total Ad Spend = Blended MER
This accounts for ALL revenue against ALL spend, regardless of attribution windows or pixel gaps.
Quick toggle test to find your real Meta contribution:
Pause Meta for 7 days
Watch blended revenue drop
Restart Meta
Calculate the revenue gap
That gap is your actual Meta-driven revenue. Compare it to what Meta's dashboard reported — that's your attribution gap %.
Most brands running this find Meta contributes 1.5-2x what the platform claims. Campaigns that "aren't working" per ROAS are often your volume drivers.
Before you kill anything based on in-platform ROAS alone, run the blended MER check first.