2750 Bitcoin... Wow that is a lot of bitcoin. Good luck getting investor, though why do you need that much money for a gambling game?
For bankroll I dont think that is much though. Because you really need a lot of it to cover some loss when player suddenly have a big win. Couple of them have a big win and others is having small winning sure will lose many bankroll. If you dont have enough bankroll to support your site, I am sure it will be bankcrupt. It is just the same as doing martingale though, need more bankroll to cover some loss
Actually we never have to worry about any size win, and we never have losses.
Our game is a traditional lottery (not a dice type game) with all payout based on pari-mutual prize pools, and our game is 100% provably fair.