Are you thinking of doing any other promotional activities, giveaways or signature campaigns? I think your site really needs the publicity.
as i said before we are working on our affiliate program and we also working on the ranking system for players depends on the total wagered each user made and it will impact on his free bitcoins and bonuses
This is standard, don't stress about it, you will get your money. They are a new site and need to be sure everything going on is legit. They have more than 80btc in their bankroll, I'm pretty confident they can handle any of your wins

what you said is very true special we are in our early days and we need to make sure that our system do not have backdoors and James1999 his withdraw & wins was very much higher than his deposit ( deposit 0.5 withdraw over 7.5 ) which make us think it might be a backdoor which makes us temporally block his account for some hours till we verify his bets and our servers security , and now we re-enabled his account after we was sure that there were no problems on our system or his bets .