I haven’t made money personally, because I don’t have much invested, but it’s not hard to see the increase in value of these currencies. Just go to coin market cap and look at some of the charts. It’s not unusual to see 300X increases in a year. Fiat is flowing into cryptocurrency like people into a life raft as traditional fiats sink like the titanic.
I like XRP as they’re working with 200 banks, and several leading money transfer companies, of which I wont name because they rip people off with fees. Stellar partnered with IBM. i like NEM, sys (decentralized marketplace), gamer credits, and golem.