Before dropping them, make sure to ASK them how they make money and how your negative came to be in the first place. it would’ve made a lot in this thread unnecessary.
If your players are winning all the time and you are on a rev share, then it’s likely that you’ll remain in the negative.
Then, ask them if they are willing to wipe out the negative for you.
I do that on a case by case basis myself and am always able to come to an agreement with the affiliate.
In general I believe it’s important to know what put you in the red.
In all, the best with whatever you decide to do.