>I'm not sure this is the best strategy for Amazon when I buy a deck of cards, I don't need 20 more types. But maybe it is effective and that's why they keep do

>I'm not sure this is the best strategy for Amazon when I buy a deck of cards, I don't need 20 more types. But maybe it is effective and that's why they keep doing it. For standard playing cards, probably not, but for collectible card games, tarot cards, the blank cards used by game designers when building prototypes, card driven board games, etc. it might be significantly more effective. Those are all "cards" things where customers are likely to be repeat buyers or interested in trying other options. They were laughably bad about distinguishing those sorts of different types/audiences in the past, and as in your example still aren't always good, but anecdotally seem to be gradually getting better. Maybe the gradual investment in development of machine learning and accumulation of data over time will result in less ridiculous suggestions in a decade or two.