You should have been around when I put the Nikon F with FTn Photomic head and 50/1.4 up for $100.
The Nikon F already went though it's collectors phase, with the premium paid for cameras, lenses, and cases matching up based on age. The early Brown Leather cases were going for outrageous prices, especially first version for the Photomic. Now, things have settled back down on the F and accessories. The F2 seems to have a run-up on prices or the cameras, but not as much for the accessories. Nikon lenses have gone up with the Digital age as Nikon retained compatibility. A few years ago, a Micro-Nikkor-P 55/3.5 non-AI was $25. prices are up a bit because of users.
I bought my F's and F2's either before or after the run-up. They've all had film through them, but are in categories of "beaters-Users-Shooters-mint". All are handled with care.