I say don't give too much thought to people complaining about the non-anonymous login, these are not the users you should be marketing to and they are not the users Bitcoin needs right now. Bitcoin is anonymous/pseudonymous but it doesn't mean every service built on it has to be.
PS: I believe Paypal and Coinbase both forbid gambling websites in their ToS. I suggest you have the code ready to switch to accepting BTC by yourself because you will most likely get your accounts disabled.
PS: I believe Paypal and Coinbase both forbid gambling websites in their ToS. I suggest you have the code ready to switch to accepting BTC by yourself because you will most likely get your accounts disabled.