This may be on occasion, but an awful lot of Leicas are bought by amateurs who cherish them and use them very lightly. In the course of time, the cameras "retire" along with their owners - the owners can't get about to take pictures, so the camera goes in a display case, or lies in a drawer, eventually forming part of the owner's estate after his/her demise.
Originally Posted by Nick Zentena
I had acute difficulty in stopping myself buying Leica R3s, I kept finding them in mint condition with lens for £150 - of course, they had been lying around and had gummed up, so needed a CLA. In the case of "jmcd" and the Leica, I would be surprised if the camera had been used hard enough to wear the wind mechanism out (if it had, the rest of the camera would surely look really beaten up), quite possibly a previous owner had hands like a gorilla and forced the wind lever hard against its stop, bending some gear teeth.