Suggestion, allow players to reset their profit/loss counter. A psychological placebo of sorts. I never gambled in my life but thought to try it since I'm an investor. I lost 0.5btc in about an hour. Now every time i come to the website i get this glaring -0.5 in the profit column that just screams "you are a looooooser". this is probably a healthy deterrent but allowing a user to refresh to 0, at their own choosing, would help them keep the thrill.
Lol. It is better to keep a fair track of your stats.
If you want to start from scratch, you can create a new account easily, just by refreshing the website. Then, you can choose a new username and password and start again. Good luck.