There's a good number of group buys for whole sets and they are surely a success, but GMK full sets tend to cost around $120 and they surely aren't for every wallet.
I believe group buy leaders should really focus on either the alphas
or the mods.
Look at billnye's numbers for his
GMK blue modifier GB, he sold 489 set at $47 which is a really reasonable price.
His set was great, he included both ISO and ANSI Enter, R3 Control with a stepped alternative too, arrow keys, and all sort of R4 keys. IMHO it only missed a 1u R1 Backspace.
It would be better to let people also vote for legends' color as black won't surely please everyone.
My two cents.