I had max level facilities when I was level 17 or so... Construction rarely stopped until everything was completed.

A max level stadium has 260,000 seats so one home league game gives me 13m from tickets and 3m from merchant, compared to the laughable 1.69m league match prize and 1.39m sponsor.

I didn't raise my ticket hard enough to get max income, but just low enough to ensure a completely filled stadium.
For max income possible I should charge $51~52 for league match but I don't care about that anyway.