Why not a finish bonus that helps push action

I know all the pride stuff and cards. Why not lower win bonus and have a high finish bonus. that would encourage a fighter as talented as silva to engage to try to get that bonus. It would have to be worked to where the show fee and win bonus was lowered and that money plus some would be for a finish bonus. So to get your total purse, fight and try to finish, doesnt have to be KO but anyway your opponot cant continue.