It's worse when the product is for someone else. I bought a XBox game as a birthday present for my nephew. I don't own an XBox. Guess what Amazon keeps trying to sell me when I log in to their site?
And I want Amazon to advertise to me. But even they have a hard time showing me relevant ads. How much more annoying will a smaller, less scrupulous advertiser be with my spending habits? If targeted advertising actually worked I might put up with it. Instead it's nothing but industrialized spam that wastes my time and consumes my bandwidth.
I ALREADY BOUGHT THE BOOTS. I don't need more boots. I have the ones I wanted. And even if the ones I wanted sucked, now I feel shitty every time I see the ad, reminding me what a bad decision I made. I'm still not going to buy another pair.