It's a terrible idea because Belicheat and the Saigon Massage old fart would quickly figure out a way to cheat the system (i.e., the rest of the league).
Like if the owner funneled money in to a company that a player owned and that player played for less than his actual NFL value and the NFL said it was not: "providing the player with "additional value" outside his contract, which is not allowed under the collective bargaining agreement." ??? something like that?