You gotta be in it, to win it. Looking at the stats on the site, it is those that have been there for several days or weeks that are withdrawing meaningful amounts. Now if you have a few referrals, you could be withdrawing multiple Bitcoins as you get a 'cut' of the winnings every time one of your referred members wins! This is still new, and the point is you have to be 'Bit' more patient and see what you might get. It's only 0.5 BTC chriss'sake! That's worth less than five bucks these days. And I myself was referred by a forum member. Fortune favours the bold...

Stats page so that you can see... http://rand.bitcat.ch/stats