Like everything else, you cash easy money when the thing is new, and no more later when everyone figured out.
By the way check below, sort by the volume 24h, see the altcoins day trading is a joke amount except btc, ltc:
http://coinmarketcap.com/currencies/views/all/
Also look the % change 7 days, it's all red, darkcoin -57%. Now the only growing past 7 days is bitsharesX +23% (daily 156k) and gameleaguecoin + 450% (daily $61k):
http://coinmarketcap.com/currencies/bitshares-x/
http://coinmarketcap.com/currencies/gameleaguecoin/
Not much else happening, or I am missing something?