Because they're looking for short term gains. Very hard to be a day-trader, methinks. Glad I'm in for the long haul. Of course, everyone wants to get rich...quickly or otherwise. Although BTC absolutely does need the daytraders money/action/whateveryou wanna call it, the question becomes: Do you believe in the idea of Bitcoin.
 As with anything, don't spend more than you can lose and if you believe in a new, BETTER system, put your money where your heart is
 Then again, easy for me to say because I'm in from way back...so what do I know?