From what I can tell, the server design relies heavily on data centers, rather than individual servers. An East coast server that's tied into the NA data center wouldn't get you anything as soon as you enter something like a roulette, because you'd be paired up with people on the West coast data center, necessitating that one of them be the one running that particular instance (or having both data centers be in constant contact and relaying everything).

You'd need an entirely new data center, which would be disconnected from the existing NA data center and thus wouldn't have the playerbase to really work that well.