I have seen one sit in a "large" pinball market for months for ~$6000 Canadian, which is ~$4500 US.
Surprisingly, of the 6 of these games in Canada, two are apparently for sale right now. One for not that much more than the quote above.
I dug this game when I played it, it seems tempting to pick up, they just don't seem to sell that fast and you have legit concerns over the orphan parts. I tend to keep my games for decades, not months, so that matters