I don't know risking so much seems really dodgy. Should be like 0.001btc minimum. You a new site you still need many many more clients before asking that much for deposit. I think it is better to lower it because you could be turning away people who are not willing to lose that much but won't mind taking a risk with a few hundred thousand Satoshi.
Its not dodgy at all, i'm doing good. Its a good site, you can make a good profit.