Well, I live in Arizona, where gambling used to be legal. In the late 80's and early 90's, the reservations utilized the loophole regarding state/federal laws crossing tribal boundaries. In short, they don't. If a criminal enters a reservation, local/state/federal officers cannot give chase, but instead must wait for the tribe to hand the person(s) over. And that's all well and good. When laws began to form limiting gambling in the state, the nations quickly formed committees to see about casinos. Them being on tribal land would make them excempt from local and state laws, excempt from taxation, excempt from regulation and enforcement. After this, they applied more pressure to shut down animal racing not on tribal lands. Which they did. All that's left now is raffles and lotteries not in their direct control. Now, that sounds to me like a monopoly; however, the tribes being sovereign makes them excempt from the law. Having to pay no heed to local/state/federal laws, the tribes here sure do have a hand in the forming of those self-same laws to ensure their continued stranglehold on the gambling industry.
That's not to say I'm either for or against gambling. Nor do I have an issue with those who choose to live on sovereign reservations. It's those that do so when it is most convenient that makes my cholor rise.