Start out with a $10-million pot up for grabs.
First half of play, both teams can accrue as much money as possible (e.g. FF style, yards/pts/catches/sacks/int all worth set dollar amounts)
Second half of play, all money is taken from the other side via yard and point differential. (e.g. an AFC interception would result in money transferred from the NFC bank to the AFC bank)
Money is divided evenly among the players at the end of the game.
...I'm pretty proud of myself right now, I think I just fixed the pro-bowl