Well, that's the thing. It's not REALLY the original art to the cover; it was a piece that was used to give the published cover its red tones. The real, inked B&W cover, along with the rest of the interiors, did sell for 250K years ago so you're right about the what the true price would be.
This piece is very cool and historic and played an important role in the creation of the iconic cover. But it's not the real deal cover art....or else I'da been all over it!
If you wouldn't mind, could you please elaborate on the process? In what way was it used to give it its red tones?
If it was part of the process at all, wouldn't it still be (in a sense) original published art?