Facility level max
The reason I ask is because I think there should be one, either through diminishing returns or just a hard cap. As far as I know, facilities provide a linear increase (while getting more expensive), and with nothing else to spend money on once your team is settled (you have good players and you economy is there), there is nothing else to do except buy facilities. If there is no cap on them, in the long term you could possibly break the game with them provided you have the income to sustain it.
Especially gaming gear is reasonably cheap and provides ingame bonuses (by the way, do these bonuses also count for league games?) and training bonuses. If you spend 5-6 seasons investing in gaming gear, things could get silly.
On top of that, newer teams would never get the chance to catch up.