The six and eight can each be made five ways. So if you are up on the don't six, you have six ways to win (on the number seven) and five ways to lose. When the bet is $10 you would win $60, lose $50, and be ahead by $10 after the 11 decisions (on average) If you see a don't player about to take his bet down just say to the fellow: "Don't! Here's 10 bucks, you're even!" He'll take the $10 because that's what his bet is.

In this system, you raise your bet one unit if you lose and lower it one unit if you win, which means your winning bets will be higher than your losing bets. It would look like this in practice: 1, lose and go to 2, lose and go to 3, win and drop to 2, lose and go to 3, lose again, bet 4, win, bet 3 ad infinitum. It looks attractive, but the end result is the same: you will eventually lose your money. A ten loss series would have you down 55 units and you would have a helluva time getting out of that hole.