The bitcoin gambling world is really saturated, but is possible.
I like more a gambling with nice promo, giveaway ecc, where is possible bet in bitcoin and more other altcoin (like just-dice with clam)
I have to disagree.
Promotions and giveaway will only help a site short term. In order to actually make it these days you need a site with a lot of features, no downtime, a great customer support and an ínnovativ idea.