I assume he bought the faucet from Amazon so Amazon knows that.  You would think Amazon would sell ads based on past purchases too.  Then all the kitchen utensil&#x2F;product&#x2F;cleaner companies could pay for an ad that is displayed after the purchase of related items, like kitchen faucets.  The weight should be lower on impressions for more faucets(unless it was returned) and higher for these kinds of ads.