To be honest If I need to pay much much above reference than I will rather pay GP100.
OK some normal price, little more than reference Supreclocked but not 200-300$ more.
Last year EVGA had really nice price for Classified, 70$ more than reference version, GTX980Ti Classified.
EVGA PCB, stronger VRM, higher clock, compatible with EKWB... Enough.
K|NGP|N was great when I payed 750-760 euro for full chip GK110 and in my country ASUS reference was 720 euro.
In USA was 600-650$ full GK110 reference, 780Ti. That was good price.
Even that was premium chip. Imagine now full unlocked GP100 K|NGP|N for 760 euro... NO WAY.