Is there a limit on the profit commission for Master Traders?

Yes. The maximum Performance Fee a Master Trader can charge is 30% per trade. They can set any percentage from 0% up to this cap. The fee is only charged on new profits above the High Water Mark (HWM), meaning the Master Trader only earns when the Copier genuinely reaches a new profit high. If a subscription is running at a loss, the Master Trader earns nothing.