It's because they know. I think everybody knows that crypto is a bubble. I think everybody believes everyone else that buys into it is dumb, financially illiterate, whatever. The crypto market has been propped up and boosted by an influx of people like that, each one knowing it's a bubble, believing everyone else is an idiot... but still wanting a slice of the pie, just in case there's another big wave coming and they will make it rich themselves. It's an interesting study in idk, doublethink? Self-delusion? Wishful thinking?