How about the status of the bankroll? To execute all your listed developments and plans, bankroll is needed. It will dictate the outcome of the gambling site since less bankroll means less accommodation by all of the gamblers. There are lots of bitcoin gamblers today so what if someone hit some big? How can you deal with that?

You also have to pay for advertisements like signature campaign since it's hard to build popularity today because there are lots of gambling sites that established a strong name even you have a unique game that no other gambling sites have. It's profitable in the long run if you can established a good name and maintained well the operation. Also doing giveaways in regular basis can be considered.