go search Pinside archives for a quick and dirty IMO
https://pinside.com/pinball/market/classifieds/archive?s=1&radius_latitude=43.116930141923994&radius_longitude=-89.32459831237793&keywords=&ad_machine_key=445&ad_condition=0&machine_type=&ad_machine_manuf=&year_from=&year_to=&radius_distancekm=322&sort_by=ad_end_date&sort_order=DESC#results
In short you will see many listings that were asking too much and ended as "not sold" or "sold elsewhere" which to me falls in not sold/not sold for anywhere near asking category. i.e. lots of asking prices are too high, games sit, dont sell, and get relisted.
OUtside of that you will see a couple super pimped examples that sold for 5k on here. As often happens on Pinside, people latch on to these high sales and think they can get good money to cash out now/ trade up into something new. I recently saw this on BM forever (been keeping my eye on that one so tracking closely. It was always asking for 2-2500 and then 2 HUO/pimped ones sold for over 3k in a short time and others started asking that much for non-HUO ones, and now months later they are still sitting as ones sub 2500 sell)
There have been over 50 STTNG for sale on pinside in the past 12 months and it is a very common game to find in the market here, on Fbook, or the other various sites. Basically it is a game that appears to trade hands often, they made lots of them, and IMO the new version plays much better (even though the art on the old is way better) for essentially the same feel of a game. I have seen quite a few trade hands for 3200-3800 on fbook groups and among collectors recently, so to me it is a safe buy at $3500.
Pinside shows a range of $3980 - $4620 which for a commonly sold game is a decent tracking (rare or rarely sold games and Pinside est can fail). If I was selling a nice one, I would list at $4500obo and be happy to get 4200.
Buying, i am honestly not too interested in the game as I dont expect it would be a long term keeper so i would want to not over pay.