Most coins are following BTC (or vice versa) if you look at the charts. BTC follows SP500 (or vice versa) if you looks at the charts. There is no advantage to investing in a coins unless you're on the ground floor and you hold a sizable piece by default. Is SP500 an ponzi-like scheme? Are stock in general a ponzi-like scheme? Even if they are, you just need to not be the bigger fool and your good.