Not only do bettings systems fail to beat casino games with a house advantage, they can't even dent it. Roulette balls and dice simply have no memory. Most betting systems in roulette and every toss in craps is independent of all past events. In the short run you can fool yourself into thinking a betting system works, by risking a lot to win a little. However, in the long run no betting system can withstand the test of time.