This is exactly what I was thinking. Lots of day traders are in the game, especially in altcoins.
I'm not trading because I feel it's pretty hard to state whether there'll be a pump or a dump tomorrow or in the next days. Crypto market is still very young and irrational to be understood, and given the relatively low market cap most altcoins hold, few hands can heavily manipulate the whole scenario.

I'm currently strongly investing in all alternative platforms to Ethereum (Stratis, Lisk are an example), as I believe that when ETH will go mainstream, attention will start to pour on them too, and money will follow.

A minor part of my money stays on GNT, SC and ICN too, projects which I strongly believe in the long term will grow and get the attention they deserve.
I'm thinking about getting into a couple of other ones too, I like to diversify as much as I can!