Simple: Some managers are so rich they release fighters with 100k, 200k, 500k, 1 million Tycoon dollars in the bank and don't even bother to launder the money for themselves; Other managers are starting out and have no money to join good gyms and develop legit projects.
To make it worse, when these released fighters get to the free market, the ones who get to pick them up are usually other well ranked managers who have loads of money themselves.
So when a fighter is released with more than 100k or whatever the treshold is, that money should go to the Noob fund to help new managers.