Why does Amazon think that someone who spent $50 on a shop vac is now in the market for a $700 Dyson?

Because their “algorithms” suck. Their “ML/AI” recommendation engine garbage sucks ass. I have no idea why publications or companies think this is in any way a better form of advertising than just…recommending things related to what you’re watching / reading / listening to…but hey…I guess it at least allows them to spy on everything you ever do anywhere on the Internet and then try to join that up to what you do in real life through phone data, so the ends justify the means I guess.

EDIT: In addition to it sucking, it’s largely irrelevant and likely prevents some sales from occurring. If I’m listening to a lot of a certain rock band…I’d likely want to know if they’re touring and may be unaware of that fact…but nah, gotta push people to buy another vacuum or whatever instead.

Some people do use the strategy of buying a cheap product if you aren’t sure you need a higher end one and then getting the better one if you don’t like the cheap one. So people who buy a cheap x might actually be more likely to buy an expensive x than people who haven’t recently bought a cheap x. Especially if they know that cheap x they sold you sucks.