You actually don't get more money for winning the game. The bowl money is put into your recruiting pot prior to bowl season starting and the better the bowl (BCS, L4, L3, L2, L1) the more money you get. The money for the entire conference is split up, so the better the conference does as a whole, the better each player does overall. You do however get Reward points for winning your bowl game. If you don't win, you don't get any points.