As other said you need something special and different that will bring people. If they want to play standard dice there are plenty of well established Dice sites already. Also I have a question, you can't log in without Money Pot account? How about option to play anonymously and log in with your BTC address?
That won't happen unless they stop using moneypot or the moneypot system changes. If they use moneypot, you'll have to create an account there in order to gamble.