Fair points there Joe. I learnt on old mechanical manual only cameras so only two controls to think about ( shutter speed and aperture ) once film speed had been selected. I totally missed out on electronics in film cameras ( F3 has minimal ) until I went digital, so have no experience of that age. Canon T90, Nikon F90 and F801 ring bells as being well regarded in their time.
I see shutterflyD50 has now a wanted ad for an F5. Not too sure about prices in the states as they are always well below those here in the UK, but a $200-$300 F5 has probably had far more use than any of the amateur models you mention. Amateurs using a few rolls of film a year v pros using 10+ per day.
Gone are the days when rub marks could give some indication of useage and no way to check the shutter count.
Don