Only worth what someone will pay. I bought one in better shape for 450.00.
Now that there are playfields again. This is a good candidate for restoration. If there are the problems he knows of, probably a few he doesn't know of.

I see all games as used and If there's playfield wear, I would want to restore it, pending parts availability. That's just me. That considered, I look at cost for playfield, plastics, translite, if damaged, ramps, which are usually cracked or broken, then, what a restored game would sell for. It's easy to be in over your head, and unless you're keeping the game forever, most want to break even, at least.