the logic in your statement is lacking, if not totally absent. income structure would be meaningful if there was no transfer market present, or older teams were not able to invest in good players and have much more money to spend. and more importantly, as you said, it is same for teams in the same league. however, this is a game teams are promoting and relegating. i did not talk about an economic arrangement for the same league, the problem occurs because of the interaction between the teams in all divisions.