Totally agree on this since each currency has their own community that can be attracted to play in the casino using their holdings. I think I saw casino that adds almost all crypto currency on top 100 on CMC before.
Sure, why not! I am sure there are people out there who hold certain amounts of altcoins they don't know what to do with. It could be a small amount not worth the hassle of transferring to an exchange to swap for bitcoin or something more valuable. But then they see that a casino accepts deposits in that coin. They can then decide to gamble with it and see if luck is on their side. If it's not, it's more profit for the casino.