It should be relatively easy to compute the win rate of the New York Yankees. So armed with that information I should be able to make money betting on them or against them. All I need to do is overcome the vig, and that could easily be done with a little martingaling. What is a win rate anyhow? How do you compute it? If I bet on heads and the first ten flips are tails does that mean my win rate is 0%? Win rate over long periods of time may not do me that much good because I may not have enough money to bet over a long period of time, or I may simply not live that long. So what good is a win rate?