I never thought Martingale method can be used in the game sportsbook, but if you do arbitration it very safe .
Martingale will never go well.
In gambling, any method will not work for a long time because in most of these calculations we can't add one factor and which is LUCK. Luck is a very critical thing, and one need to win money from gambling on a regular basis. This method may work until one don't get a continuous loses. So gamble carefully and good luck to all.