Extra rewards and bonuses in case of win to the high bankroll players on the next promo, like said @ndnhc would be great and fair and would not exclude those players betting with low bankroll, as well.
We already did that in this competition, as players with 1BTC + bankroll were playing for triple prizes.
It's not enough. We put 200k DOGE in a single bet but they play whole game with 1000 DOGE is like a joke.
My suggestion is put a minimum amount to join this competition.