Earlier quoted context omitted.
> people who sell stuff think they'll get a higher conversion rate the more targeted they get.... and that's hard to argue with. Is it really? For me, targeted ads come up for either a) products I have already purchased or b) products I've looked at and then decided not to buy. I got my wife an espresso grinder for Christmas, ordered on Dec. 10, but AdSense is still showing me ads for grinders. There is exactly 0.00%…
Campaign A: Show 10,000 random people ads for espresso grinders. Campaign B: Show 10,000 people who recently looked at espresso grinders some ads for them. 95% of the first group didn't know espresso grinders were a thing people bought. The remainder probably aren't actively shopping for one. In the second group, some portion of the audience has already bought an espresso grinder, or decided they don't want one right…
As a matter of interest, is someone who has previously purchased an espresso grinder more or less likely to buy one than someone who hasn't?