* buy an item from Amazon (coffee maker or otherwise)
* realize the build quality/size is rubbish (which from some of the less well known sellers, it really can be)
* return the item using Amazon's generous returns policies (never had one rejected, I've used it many times)
* buy a different item in the same category.
* repeat?
If this type of purchase happens a non-negligible number of times, could that be the reason we see so many 'buy more of X!' style ads?
Haven't you ever wish for a 'Punch Advertiser' button during commercials? This would be like hearing they built it themselves.
(To be clear, by having someone making $0.03/click sign their customer up for buyer's remorse thus destroying the profit from serving them because those return policies, the customer service time, etc, aren't free.)
And yet, if I buy a coffee maker, the front page is covered in coffee makers for weeks. I've never bought anything based on what's on the front page and I'm not sure I've ever even clicked those suggestions. I'm sure targeted advertising can work in the long run, but at the moment the success rate seems so low that it's more often an annoyance than a convenience.