Still, your suggestion is far too complicated.
I prefer a more ... static ... tax system. Savings up to 20 times the TV money is "tax free", 20-40 times it´s 1% tax, 40-80 2%, above 5%. By connecting it to the TV income you make sure that teams can hold upon a certain "emergency case" money reserve they can invest once their key player goes down with injury or such, still you encourage teams to actually spend and keep narrowing the gap between those who have and those you don´t.
Also, I´d like to spend this money between the teams reaching the playoffs to make sure it´s not only "draining" money out of the overall economy system. Just "taking away" money from the market will do no good.
Zwei Dinge sind unendlich, die Dummheit und das All...