Selling something to me can occasionally be helpful, because I need things from time to time, and at that moment offering to sell me a thing that I need is helpful. What is annoying is that with all billions upon billions supposedly spent on figuring out what I need to sell it to me, the best they can do is "oh, you bought shoes once? Clearly you're the guy who's into buying shoes, let us spam you with shoes ads for the next 5 years!"