Allow for a 'success fee' hurdle linked with GVT

From https://en.wikipedia.org/wiki/Hedge_fund#Fees_paid_to_hedge_funds , 

"Some performance fees include a "hurdle", so that a fee is only paid on the fund's performance in excess of a benchmark rate (e.g. LIBOR) or a fixed percentage"

It would be nice for the manager to have an option for him to not take any success fee if his fund did not outperform GVT - this would give further confidence to GVT hodlers to invest in the platform.