I was thinking about Finances for the stadiums our football teams play in.

it should be where we can charge for certain seats , food , parking , etc.

Having this would help us with our salary cap , hire coaches , sign players and/or in the instance of custom leagues help us with our move from one city to another.

Stadium income, etc., has nothing to do with the salary cap or signing players. The cap is the same regardless of how much money your team makes, in MFN and the NFL.

It would be kind of fun though to have a team "profit". In custom leagues, your team earnings could be used to purchase credits to customize your team.

Nothing major .. Maybe up to 5 additional credits?