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and maybe you have a limited budget (nothing wrong in that)
They claim to have a bankroll of 10 bitcoins, but to be honest this site doesn't represent a casino company with that amount of capital. Even spending 0.5 bitcoin to making a site better than this one to attract new players won't bankrupt them instantly, unless their claims are false. (just my thoughts, as the title required).
The best way to prove this information is true would be by signing a message from the btc address holding 10 bitcoins owned by the casino. This way one of the biggest doubts could be cleared up, decreasing the suspiciousness among gamblers, consequently helping the casino to grow its users' base faster. Thanks to blockchain transparency is possible and accessible, while also guaranteeing the safety of the coins' holder.
+1 for this. That is the simple thing they can do to prove to us so we do not doubt that they have some money to run their business. It needs transparency to us so there will be no more question about how much money they have. Besides that, I think they can grow their site with that amount as having 10 bitcoins right now means, $610,000 and that's a lot of money to talk about. It will help them gain trust among the members, which is the important thing to grow the business.