I'm serious. A number of completely unrelated tribes have found ways to leverage their enviable tax-free status to make a LOT of money under the American system of capitalism. The aforementioned Mohegan and other tribes in Connecticut. And the Seminole tribe of Florida, which has nothing to do with the others, but now owns the Hard Rock Cafe chain and the giant casino complex they built on their reservation. And, of course, there's selling cigarettes wholesale without the taxes, which attracts lots of smokers to fill their cars with cartons of their favorite sorts.
The tribes that have done that sort of thing are doing quite well, with nice neighborhoods, college scholarships, and stipends for every member of the tribe.
That special status of a reservation is a hell of an economic advantage if you choose to use it, and the model is already there to be seen. If you want to succeed, you have to do it yourself, and, well...the means are already there for them.