Anonymity and popularity of Cryptocurrency are two of it's the best attraction.
And Cryptocurrency games are more transparent.
Will, there comes a time that all online gambling sites will be Cryptocurrency based?
I actually have some friends that do not want to open theirselves up on these cryptos. And we should respect those people.
Well maybe for now they doesn't disclose this option since they don't know how this crypto things works for them so maybe make them realize how good crypto is interms of transaction and profitability, maybe they will consider it in the long run. Remember bitcoin spreading like wildfire so provably in future the information regarding on this will come unto them.