Knowing Weirdstuff if I had to hazard a guess *if* the machine worked at all they probably had it out on the counter for a few weeks with an incredibly ridiculous price tag on it before they did.
(On more than one occasion at that place I've seen a "neat" piece of hardware sitting there for a few weeks with a "the bidders went crazy on eBay" price, which of course no one will pay, until it gets broken by some naked ape dic*ing around with it. *Then* it disappears. Since obviously no one is going to pay more for a broken TRS-80 or Atari than they would for a working one it's pretty obvious what happens.)