I believe the dice in general should be taken out of the game, how can you expect people to join the server, get luck at dice, and never have to earn there own items?
You should input the Sink Hole effect with a gambler at home which only allows people to dice 55x2.
Bets allowed per time.
Player - 2million max bet
Donator - 5 million max bet
Super Donator - 10 million max best
Extreme donators - No limit
Staff - No limit
Dice are just at game of un even odds and you won't be able to grow a server if you've got players and staff cleaning people and making them rage.