This rule of Wagershare.com is well over a year old, has affected me and is in my opinion completely fair.
Most companies will remove the no negative carryover rule completely because they lose too much money on it.
The point is:
As long as your highroller loses, you win, but if he wins you lose. Cant expect to earn 15k on a guy that won big the month before just because he lost it the month after. +15k – 15k = 0
And a fair point to mention, you still earn income from all the other players irrelevant of that highroller so they still take a risk.
Wagershare is a solid company, one of my preferred and have always treated my account fairly. Cant speak for others but I will trust this company a hell of a lot more than most of the recommended programs at cap.