Maybe could be enough to do from teams a twisted joint stock company. So if you acumulate any money at the end of the season, shareholders will get a cut from them, because they can take these money as a "profit".
The cut could be done by percentage, so would motivate you to spend these money before there will be this shareholders payment. And this cut would increase with your financial turnover.
So if you get from TV, merchandise and attendance every week 500k, theirs cut could be 30 percent. If it would be 1000k, the cut would be 60 percent.
I mention 1000k turnover, because while is impossible to cumulate a bigger cash, because shareholders will cut you down if you have any, you can get better income every week with that, to afford such a players.