Do you know the "color trick" in Roulette? Basically you always bet on the colors and if you loose you bet the double of before on the same color. Do do this until you win, which is almost 50:50. But in the casino this trick isn't really working as you have 2 white spaces and so the chances are only about 49% and therefore the Casino is going to win.
Here in MagicDice the chance actually is 50% and therefore you are going to win eventually (if you stop at the right time). I don't know how they can make money.