What other cryptocurrency are you using and which casino are you playing at? BTC is getting to expensive to be depositing and playing in just BTC.
Actually bitcoin , was really expensive. Why ? Because of its too high price that's makes it more expensive. Aside from that bitcoin was the main coin use in gambling because if you won using this coin , then you actually won a huge amountbof money. But as you can see even if the value of bitcoin was too expensive its many gambler are still using it and believe that bitcoin will give them a huge income.
I think the real problem is the volality of bitcoin because people are afraid the their money losing their value overtime. When you buy bitcoin and deposit it on a gambling site you have the same amount of money you have spent because the value of bitcoin is the same but if you hold it there for a few months that value will change since the price of bitcoin will also change.