You can only win if you hit a lucky streak, stop playing and leave. But the casino will do everything imaginable to entice and keep you there so that the time factor gets back their money.
The longer you play the higher the guarantee for the casino that you will lose all your money.
Poker of course you can win since you're playing against other players and the house advantage is not in the equation.
You can see a good analysis of casino VCL's on this chart.
http://www.urbino.net/VCL_showCharts.cfm