Plans to create a casino for cryptocurrencys

Hi there
I need your help to improve my ideas about opening a casino for cryptocurrencys. I’m not sure, what kind of casino it should be, but maybe like this It should be a casino site for all crpytocurrencys and only with them. No real money! Also I would like to know, what do you think about a ref system to earn ethereum, bitcoins and other cryptocurrencys?

And what about taxes?

Thank you