With used Leica cameras and accessories, because of the nuttiness of collectors, price Is mo benchmark for quality or usefulness. I have M3,4 and 5. I have used my M5 with absolutely no breakdown...except when I dropped my brand new M5, in soft case on marble floor of JFK airport 50 years ago. Camera and meter worked perfectly, except that counter was knocked askew. Quick fix by friend who worked at Leitz.
I have seen collectors pay big bucks for cutaway display models. Are these better cameras for taking pictures? And then there is fashion. We should be thankful for all the hippies who wore Nikons as a decorative accessory, otherwise, where would many of us find those like new Nikon F &F2 cameras today.
Speaking of price drop. Leicaflexes often go for less money than I paid for my CLA....except that I bought my cameras new and know they have not been abused. Aesthetically, they have the most beautiful design of any 35 mm slr ever made and fit in hands nicely. Never had one fail me yet, which is more than I can say for PhD cameras that I have used.