In Dice problem is that you can win 10%, 20% or even 50%, but then you loose. In fact it is not real to make 100% profit. Dice site owners make profit and that's all. 
of course, is the whole idea of any casino game. (owners making profit)
yes and that is why gambling is a bad habit.
So gambling is a scam?
if you have win 50% or even 30% is good for me you must withdraw and collect your profit but the problem is all player always want more and when they lose they all say that the house scamed them. even the house have risk to lose but it is less than the player risk.
Scam = Scheme to take someones money
Casino = Games to take someones money