Perhaps I agree with you that Monero is great for using in anonymous payments. About a real casino with the possibility of paying in Monero would be in demand by those players who want complete anonymity.
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I only wonder why many recent casinos didn't bother to add this wonderful coin? And even some popular sites like stake and primedice, we cant also see monero coin on them? What could be the reason for that? HHmm.. but the player seems to not care on it anymore but many players are used to using bitcoin and other altcoins.
I think that casinos are just afraid to implement payments in Monero. And they can be understood. After all, they will publicly inform users about such payments by writing about the possibility of paying for Monero. And this will immediately attract the attention of all those who, on duty, follow the "money laundering". Well, the corresponding checks, hassle and other troubles leading to the loss of money will follow. And they can generally be accused of this laundering, closed, and even initiate a criminal case.
Not a single sane casino, I think, will go for it.