Why your CPMs spiked after you 'scaled' — you're bidding against yourself.
Launched 4 lookalikes, CPM jumped 30%, ROI tanked. Classic audience overlap.
When 2 ad sets share 25%+ of the same users, you auction against your own dollars → you literally drive up your own price.
Run the overlap report. Anything past 30% → merge them or exclude.
Scaling wide without checking overlap is buying your own traffic twice. Check it.
Buyer's Trenches
@BuyersTrenches
Why your CPMs spiked after you 'scaled' — you're bidding against yourself.
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