It is pretty basic maths that will demonstrate that this system doesn't work (as in it doesn't "beat" the casino). You say you won $10k, but how much money did

It is pretty basic maths that will demonstrate that this system doesn't work (as in it doesn't "beat" the casino). You say you won $10k, but how much money did you have? You said at one point you had $60k on the table so let's assume you had just that - if you put the entire 60k on something which has 7:6 odds then the odds of you winning are high but exactly what you would expect given the winnings compared with the bet. When you play with the martingale strategy your odds of winning aren't any better, you just think they are because you don't realise your entire pot of money is actually at stake.