oops, correction
2-1 on even money is not a 100% return on investment, it's a 50% return on investment. .5(2) - .5(1) = .5. To be precise, this bet is .493(2) - .507(1) = 47.9% edge. The suckers are at a disadvantage of .47.9%/2 = 24% since they lose what I win, but they bet twice as much. Also, I don't win 67% of the money that goes in, only half, but 2/3 of this is my opponent's money.
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