IMHO that's because ad targeting and ad profiles are still extremely crude. It sounds like you're talking about retargeted ads -- you look at a product and it s

IMHO that's because ad targeting and ad profiles are still extremely crude. It sounds like you're talking about retargeted ads -- you look at a product and it seems to follow you around afterwards. The tech is too dumb to know you already bought it, but on average it's pretty effective.