So, about G1 Victory Black Shadow

I was browsing ebay a few minutes ago and an auction was just about to end. At a glance I had thought it was Generations Sky Shadow/Black Shadow and clicked it for kicks to see how it'd end. Then I saw the price, and that it was Victory Black Shadow. It ended shortly after at $1200!
So, why is Victory Black Shadow so apparnetly rare? The only time I hear prices like those thrown around is with your typical grails, your G1 Fort Max (prior to the recent reissue), Victory Leo, etc.
So, why is Victory Black Shadow so apparnetly rare? The only time I hear prices like those thrown around is with your typical grails, your G1 Fort Max (prior to the recent reissue), Victory Leo, etc.