Virgin Valley is now Match Grade Machine and is an excellent, quality made barrel. Actually, you should get rid of the damn thing. I'll send you my address and will be happy to take it off your hands.
As to the value, I don't believe there is any collector value associated with it, other than it's a desirable cartridge and an interesting contour. I would buy a new MGM barrel before giving a premium for a Virgin Valley barrel, if that makes any sense. That said, if it comes with a forearm (matching the hanger bar), it's likely worth $400 or so.
My 2 cents...