losturmarbles, I dont want you to lose your marbles but.
not everything in betting is mathematical, in fact its mostly psychological and regardless of odds, the draw in soccer is not a popular bet. Thats why years ago the books decided to invent asian h'cap which makes it easier for the bettor to understand but hides the significance of the draw. with the availability of betfair to lay, bettors are now looking for an edge in betting the draw at the best odds in order to maximize an asian bet on minus or plus 1/2 a goal, which increases the interest in the draw odds. outside that the draw is insignificant as a liability to a bookmaker, hence the reason for presenting it at no vig and holding their percentage on the other 2 and more likely bet propositions.