Don't think of them as not being used, think of them as in reserve.
I don't have a problem with people not using gear. They'd probably only make bad pictures, anyway, if they have no heart or talent in it.
I have a contrarian view toward the camera collector. I believe they provide demand that keeps companies like Leica and C/V-Bessa making cameras and preserve for future users other gear. How many old large format cameras would have been junked long ago if they didn't look pretty? Now and then they will fall into the right hands and given a chance to be used after resting for a few decades.