If I had the capital to build an online gambling empire I would build one similar to WOW but better. A full on world where you can create your own avatar and travel around in it, go to a poker room and choose a game to sit in. A real table with other avatars of real people as close to real as possible. The world would include travel from casinos
in Las Vegas to Atlantic City, to Monaco or where ever.
I would try to get sponsorship from each casino represented by the real casino. You could use either real money
to buy cars to travel from casino to casino, or jets to fly to poker tournaments around the world. If you were a high roller you should be able to hire a limo and throw parties at exclusive clubs. I would try to make the in world currency earn it's own value which probably would be different than real world currency and have a practical exchange rate.
There's a lot that could be done to make this highly attractive, fun and profitable. Online casinos
like Full Tilt and PokerStars
who dont have physical locations could be on the moon or on asteroids ... even starliners. heheh it could be awesome.