Free: Contests & Raffles.
I'm wondering how they built all the casinos without any culverts? They are part of the population & infrastructure of the area.
The tribes will need to be careful with how far they push this. It's all well and good for the public when it is culverts. Wait until this shuts down commercial fishing in Alaska, causes the feds to have to tear down dams, seriously hinders development, etc. There will be a lot of political pressure from folks with even more money than the tribes to address the treaties. If they aren't careful, the tribes might very well kill the golden goose.
The best counter to this is not the courts IMO. Threaten to legalize casino gambling would get the tribes attention. The State Democratic party is heavily influenced by all the tribal casino money though so not likely to happen IMO.