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78% overlap with the audience it was built from. A lookalike seeded on 48,206 purchasers has mostly rediscovered those purchasers, so two campaigns are bidding for the same people through two audiences and paying the auction twice. The overlap column is computed pairwise on every refresh, because a lookalike that drifts back toward its seed does it quietly.
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Below the 2,000-user floor Amazon enforces, so it cannot be targeted at all — it is not that it performs badly, it is that no campaign may use it. Widening the window to 365 days takes it to 4,880 and makes it usable; the screen shows the floor rather than letting an empty audience look like a failed one.
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