CasinoRPG

From GoldFire Studios:

CasinoRPG is a new kind of massively multiplayer online game that merges role-playing, tycoon and city-building with casino game favorites like poker, blackjack and slots. Players are given the reins to a sprawling Vegas-themed city that evolves and grows through the collaboration of thousands of players all over the world. You start life as a lowly casino janitor, but through skillful gambling, jobs and story-driven adventure, you can build the ultimate casino empire and build the strip of your dreams.