Anyone saying 20k is crazy. If they’re routed then they’re beat. The guy probably doesn’t know how to maintain them and you’ll find a much different story under the playfield I’m sure.
15k to an operator is good. There was a guy who bought 8 classic B/W near me for around that. This guy isn’t a hobbiest. 15k is a good offer and 17-18k is MAX. 20k is silly, they aren’t worth it.