that surplus goes back into the stadium for maintenance and projects (which are implemented to try and get fans into the stadium by improving the stadium experience) though. It's not like anyone is taking home $2m every year.
What would help is if the council realised that it's user pays system is actually losing teams money to the point that using the stadium isn't an attractive option, we are losing out on events to other city, or the team will simply stop existing or move to another city (Petone rec, Auckland), and start contributing to the stadium so it can bring the cost to teams down.
The stadium won't want to lose the nix (or any other team/event) any less than we do.