Hey all, longtime F3 shooter, I've posted many of my news PJ and wedding stories with both the F3 and the F4. At one point in the early 1990's I personally knew all the photographers at both of the local daily newspapers and out of the staff of 5-8 on each paper every one of them shot Nikon F3's, usually showing to events up with two or three bodies. There was one guy who shot night sports with an Olympus OM-4 with the 250mm f/2 (incredible lens, the only time I've ever seen one) but for the most part most shooters chose the F3 until the AF shift to Canon happened. I managed to scoop a bunch of Nikon gear when both the papers went to AF with one paper going full Canon (corporate decision).
I've kept most of my old F3's from that time, I transitioned to doing weddings with a partner and we shot F3's and F4's (for flash work). All of my F3's got some sort of CLA/repair at some point (back when NPS had strongest emphasis on the P and was Very difficult to get the membership), and I've shared how one body with a 13xxxx serial number (the oldest of my F3's) came back from NPS with a 19xxx serial number, so don't assume a high serial number is indicative of low use. That one F3 body was not one but two daily news photographer's daily shooter for years, I figure it did 5-10 rolls a day for at least 4 years before I got it. That one had one or two cracked FRE fixes and the last one is when they sent it back with the new 19xxx serial number. It still works as intended and I try to run a roll a two per year thru it to keep it operational.
SO, durability is far far beyond what most shooters would ever consider possible, which is why I've always recommended the F3 to anyone interested in a film camera, and for a while the prices were just unimaginably low. I picked up a perfectly fine looking F3HP for 25.00 from a photo buddy a couple of years ago (before the spike); it needed a bit of cleaning and a relatively simple shutter adjustment and I passed it on to my niece as a present (mounting an old 28mm f/2 with metal hood on it).
Side note on the shutter; as I understand it the shutter always operates full speed at the beginning of the sequence, and it is the electronic control of the release of the 2nd curtain that allows the crystal timing of the shutter. In the adjustment of the above mentioned F3 what was required was a slight tinker with a screwdriver while firing the shutter into bright sunlight; I could see the early capping of the shutter on 1/2000 and by the smallest of adjustment I was able to back the capping off. The factory repair manual gives the procedure, it seems you get that top mechanical speed correct (or close enough to not cap) then all the other speeds become correct. Nikon's History about shutter development gives a lot of good insight into what was considered a uniquely durable shutter. I have not a doubt that any semi-competent camera repair person should be able to do most common fixes on an F3 (other than an FRE replacement; and I agree at some point someone might consider doing a small run of custom FRE replacements).
As for the spike in prices I've long thought the F3 was very undervalued. What is now even more undervalued is the MD-4; those were 1/3-1/2 of a new F3's body only price, and most enthusiast owners of both never ever got close to maximum useful life out of the camera or the motor. 20-30 dollars for a motor of this quality is insane. If you're interested to see what the F3 can really do with a motor track down an old MN-2 Nicad battery pack (most likely needs a rebuild with NiMh cells), lock up the mirror and let her rip.