It is something that bugs me till today. Are they mostly newbies trying to find a path to enter cryptouniverse or experienced people who are just gambling to score a moonshot on luck?
This is the "meme" rank on coinmarketcap, there's millions on deflationary tokens with no effort from the "devs" at all. Just copy/paste a code, copy/paste a whitepaper, eventually pay few bucks for a domain and that's it.
Why people fall for that, yet?
Realistically, it's a bit of both.
Seasoned veterans in the crypto wild west capitalize on the ignorance and naivety of those who are less experienced. Memecoins don't have much of a future, but these people know how to play the psychological game and hype things up in the short term to look like the best investment you'll ever make in your life.
Newcomers believe these people because they have wide social reaches. This is actually a huge problem that runs deep - this almost gambling-like craze that goes on peoples' minds when they first enter crypto.