Principle law of economics
is that free enterprise is driven by supply and demand. The supply (casinos) is small, and the demand (gamblers) is high. As a result, it is an enterprise's market. When competition increases, it becomes a buyer's market. In Las Vegas, the competition is fierce, and as a result, the buyer has a great market in which to shop. If Vegas was pared down to just one casino, then that casino can control the market (monopoly) and determine the market conditions. This is already happening as casinos go from individual and private ownership, to corporate and conglomerate ownership. Now that most properties in Vegas are owned by only 3 or 4 major corporations, the competition is not so diverse, and conditions are getting worse. Consequently, some of the best casinos in Vegas are the ones who are small compared to the big-brands out there. E.G. Palms has better conditions overall compared to Wynn, MGM, Park Place, etc.
For local play, Stations pretty much sucks, but they are the lion's share of local gambling.
To prevent things from getting worse, I think the NGC should limit the portion of the market of which a company is allowed to control. Sort of like what the FCC does to prevent the Networks from owning everything out there.