There is also possibility that his winning also came from just small capital. Since it's not that trusted website I don't think some one will just deposit big amount to the gambling site that he never use before . For what ever reason is even they have event that promise a good bonus it's still no way you will just trust your money to unknown gambling websites just because of bonus.
Either way, OP has the guts to deposit on that site relying only on limited information. Or maybe it was started on the usual scam scheme wherein a player will surely win but needed a deposit to withdraw the amount.
https://bitcointalk.org/index.php?topic=5081286.100We don't know the reason but maybe someone lured him to use the site.
Anyways, almost a month now that OP doesn't come back here so maybe it's time now to bury this thread for good. Keeping the thread active will just make the site name bumped as I have mentioned, they are still active.