Well, if you'd like a reference point, there was one at the AGS auction last weekend in Harrisburg. It went for $275 because I wouldn't go to $300 (there was myself and one other person bidding on it). It was in OK shape physically (scratches on the glass, the papers under the glass were a little wrinkled, one corner dent, leg bolts looked a bit rusty), and it did power up and the attract mode did display on the monitor (I didn't get a chance to coin it up - I couldn't easily figure out how to do so manually). The monitor had a little wavering on the left hand side, but it was eminently playable.
It came in on very nearly the last truck that was unloaded. Until it showed up I was planning to leave when the bidding started, as there was nothing else I was interested in.
Speaking of the auction - did anyone notice what the Ladybug Cabaret went for? It was pretty beat, and I don't know if it worked, but I was curious anyway.