2012 there was less demand and people were happy to get rid of gear that was not being used and just took up space. Demand went significantly up. And the gear is becoming less. A good example was mentioned in the thread: winder cranks for Bronica SQ. Almost impossible to find. And I think I found one of the last new Nikon DK-17m eyepieces at a dealer for my trusty F5. 5 years ago they were being sold on eBay for 1/2 the price. I will get this one for "suggested retail price"...... I'm comparing it with
what things normally sold for from 2012-2018.. ..t.
I shoot with a Bronica SQ setup. 10 years ago I could have gotten a SQ-Ai+80mm+WLF for ~400. And there were always 2-4 for sale online locally. Now once in a while one appears and it's 800 bucks. Don't even start with Leicas. And we, as film photographers, are a part of the problem, because we are looking for the gear and buy it. We encouraged people to shoot film. Film became a thing.
So, since available gear will become less, with stable or even rising demand, expect prices to go up even more, especially for what it's considered good gear (Nikon Fm3a, medium format,...)