honestly it's kind of tough to give a pc on these. I might be possible to get 100k+ for this, but the only ones i've seen go for that have taken weeks if not months to sell. I'd shoot for 100k and see how things go.
I've got a r9 20/10 Air Dragon Staff myself and it's a real pain in the ass to sell.
Nobody even wants it for 15k. So I doubt this will hit the 75k mark.