This is just a form of gambling. Post-modern Ponzi schemes are gambling games that some people enjoy. The people who play them aren't necessarily stupid, they value the entertainment more than the expected reward.

If you know you're giving money to a ponzi scheme and see all the rules of it, is it really a ponzi scheme/gullibility? It sounds just as interesting as betting on sports / stockmarket / ...

People still play roulette or blackjack, even though they know they're guaranteed to lose in a long run / on average.

I think it shows a pretty relaxed attitude. Programming an autonomous ponzi scheme seems like a fun hack to write.