What’s the point of buying NFTs? Please explain.

I’ve been doing my best to try to understand why people buy NFTs. I read one said that it is because when an art is sold as an NFT then we can know the who owns the original when the art is bought. Yes, I understand this even if I am not a professional artist because it does make things easier for people to know who the owner is but I am really confused as to why people keep buying the same old ai generated trash that costs so much in the initial price bought but goes down as the time passes by. So please I’d like to understand why people keep buying this same ai generated trash with a teeny tiny slight differences when their prices will only go down as the time passes by?