[patmcguire]

I see this sentiment a lot, but I think it probably does make financial sense to show you ads for a thing you already bought. There are often a few whales out there who are buying one of a thing to sample and then might later buy hundreds or thousands.

[jfk13]

If I were buying a sample of something, with a view to buying in bulk, I don't think I'd base that bulk-buying decision on ads that follow me around after the sample purchase. I've already found the product and bought a sample; any decision to buy a thousand of them will be based on my evaluation of that sample. I'm not likely to forget about the whole project until reminded by an ad that stalks me around the web...

[patmcguire]

Doesn't matter how low is if the payout is high enough. Also, it's not like they've got any better ad to show you, CTR is something like one in a thousand for display.