I always have this thoughts that this kind of sites is a ponzi scheme so you need to be more careful dealing with it and once they ask or require you to deposit some money before you can execute your withdrawal then start to have doubts since most likely that site is a scam.

We hear the same scheme for many times where they put appealing amount to their user account so they will get tempted to deposit then scam them. So beware on this attempt since this another scam method used by scammers.

Also don't think its your money unless its in your hand. If you can't pull out this amount in this site so better go away since provably they think about scamming you for second time again.