Coney Island was never a gambling mecca in modern history.
Atlantic City still does fairly well - as with Foxwoods and Mohegan, it sits in proximity to a lot of people. Gambling rather than resort destination.
Vegas is the only place of its sort in the US - and the first gambling mecca to come along with genuine westward expansion. And it has no competitors because there isn't a leg up on it to be had - if people are willing to travel far, why would they chance the new destination rather than the known quantity?
And yes, there are people in the middle of the country.
Uh-huh. How many people within a three-hour drive of the central point of Pine Ridge?
Where's the airport that brings in people from around the country? Who's going to foot the bill to construct one?
The notion that they could just pull themselves up by the bootstraps and create Vegas (even though there has never been a competitor to Vegas) or Foxwoods/Mohegan is insane. The situations are different. Vegas came along, as I said, with a boom in interstate travel and population growth west of the Mississippi. Mohegan and Foxwoods would not exist if they weren't dead center between Boston and NYC and all the millions of people around them, with easy access by car or by air.
"I turned this 1000 acres of prime farmland into a cotton fortune! Why can't you turn your 1000 acres of West Texas dirt into that?"