True for a lot of games, for sure...but not ALL. The crazy money is usually focused on a handful of titles...before the CGC remakes, AFM/MM/MB were the darlings of pinball. I had a HEP AFM, Keller MM, and original MB...all good games, but they all got old to me. Of the 3, AFM lasted the longest (8 years). Despite being a loved title restored by a beloved restorer (Chris Hutchins), I lost 3k when I sold it in 2018 (https://pinside.com/pinball/forum/topic/for-sale-hep-attack-from-mars)! The most I've ever lost on a game, and I've had many.
Right after selling the HEP AFM, I purchased a TRON LE for $10,500. At the time, the price was considered quite high. It "sat" on Pinside for many months before I decided to buy it. Sold it 2 years later (at the height of COVID hysteria) and got full price soon after listing it. Here is the ad (https://pinside.com/pinball/forum/topic/for-sale-tron-legacy-le-249)...notice the 28 "thumbs down" on my $21,000 listing price Considering it sold quickly for full price, if Pinside rating were smart/fair, all this thumb downs would flip to thumbs up PS: If you look at my TRON FS ad, you'll notice kklank busting my balls as well (so don't take it personally...some folks are perennial, virtual "Karens" when it comes to FS ads).
Back to beloved 80's games...the last 80's game I sold was Fathom (https://pinside.com/pinball/forum/topic/for-sale-fathom-19). This game also sold very quickly for full price. Considering this sale is over 3.5 years old now, I imagine this example would easily sell for 10k today. This isn't necessarily proof that your pricing it right, but I think it's close. You and I admire the rare beauties/survivors from this era, but a lot of the money today gravitates toward the new Stern titles. God forbid Stern builds a game without ramps (like Beatles)...people freak out, saying it's old/cheap/etc
In any event, it's cool you haven't received any downvotes on your pricing...a good sign! Paragon is a stunning game, and we have 2 of the best examples for sure. Personally, I will never sell mine. It will be handed down to my kids when the time comes