Its a bad idea. It will allow the strongest teams to get stronger, whilst the weakest teams will lose out.

It would be unfair on those who don't buy tokens for example if they were in a league with a couple of token buyers as they would struggle to compete with the token buyers as it is. If the token buyers then got a bonus of even more tokens for wining the cup or league then it makes the task even harder for some, whilst easier for others.