I'm a bit confuse about your mechanics and calculation. Why is it that players with higher bets has a higher chances of winning? Isn't it unfair for those who have a lower bets?
I just want to understand how fair the game goes on that part.
However, your site looks great and user friendly. I hope you would that have great promotions in the future as well.
Because it is basically like a raffle, the more money you spend or the more tickets you have the higher chance you will win the game. Just like other similar lottery/raffle game. Where is the unfair thing? If you say that it is unfair to those who have lower bets or lower number of tickets (lottery in general), then it means that you want a lottery game where all players get the same winning chance. If I'm right, then you should try to find lottery with fixed prize of the ticket and there is a rule that one ticket per person only.
If in this kind of lottery with no fixed prize of amount that you should spend but you want to have the same/equal winning chance then it wont be fair for those who have bigger bets. If you want to have equal winning chance in this lottery then you should bet the same amount as other players. By the way, the site seems to be abandoned already. OP is not active anymore, so lets just leave it. My main idea is that fairness on lottery game is not about how much the amount you bet compared to others but it should be about how the site draw the winner(s).