After from Bitcoin there are other altcoins that's good for investment and you will be glad you did, he messed up by not studying the market properly, is not greedy is just unfortunate the investment turnout badly. Some of the altcoin projects are scammer but few are real but not much investors in it, so it can't grow. Before you invest I'm in any altcoin consult those head of you in cryptocurrency, they will tell which to invest in, to me if you want to invest in Altcoin ethurum should be the only option for me.
There is no doubt that the Altcoins sometimes bring about huge profits than bitcoin due to their high volatility but just as you said there are many who of them who are just scams and as such no need to go there thinking of them as investment. Altcoins are just pure gamble that even if you ask the most experienced investors ahead of you they will simply tell you something base on how former similar project has performed, which is still just a risk.