> Currently the lottery has a 25% cut of the total amount in the lottery. This is used to pay for development, server costs and maintainence. Eventually, my goal is to decrease the fee to as small as possible to allow for the largest winning. This will take place when the development stops (meaning there are no features to be added) and/or the lotteries take place more often.

I find this to be backwards, you are effectively punishing your early adopters. It seems to make much more sense to make the cut lower (or zero) now, and increase it later when you have more users.