I know it not fun be negative in stats.
I think it is because they giving affiliates 40% which is one of the highest % I have found a RTG casino give.
If a player wins you go negative like many other programs.
They convert good for me, I have also been negative ones, but now always positive income, players seme like the casino and come back allot.
If you dont like the % deals, maybe you should ask them about CPA deals instead.