I own around 20 or more cameras, but not much more than 20, I never in my buying of cameras intended to be a collector and I don't consider myself a collector.
Three of these cameras were indeed bought new by me and one was a gift from my parents...all of my cameras have been used at one point in their lives and would never be confused with many a camera collector's prize possession...
I still own this small collection of cameras mainly due to the love of cameras and also to the dramatic drop in film camera prices...I would rather keep them than sell them for pennies on the dollar...I would also do better to give them away to someone who would use them and possibly grow to love photography as I have...
I have also said many times in here that I have put off buying any more camera bodies for this year and now plan on continueing this thru next year...I can live with and actually feel good about this decision...
Now having said all that I have no problem with someone collecting cameras and actually enjoy looking at camera collections...it's a part of the photographic history that I like looking at and at times actually holding...
I am also not a 'collector' in the true sense of the word. I do not look for prime examples of various pieces to 'complete' a given system, but rather seek out inexpensive items of the sort that have been reported as having good photographic qualities, cult items, and the like. I generally can only afford the less-expensive, lower-to-middle-end of the spectrum, so I have no Rollei's, no Hasselblads.
However, I have owned cameras like the Diax IIb (just an example). Why? Because I saw it on CameraQuest or someplace like that, thought it was neat, found one on eBay for cheap, and bought it. Now I know a lot more about the Diax than those who have only read about it - just because I had one, used it, played around with it, and yes, it also sat on a shelf for a couple years before I got around to selling it. I've got some cameras that I haven't used in years and probably won't again anytime soon. I just like them, so I don't want to sell them. Anyone who has a problem with me 'collecting' things like that can go jump in a lake. Do I not use the Diax 'as intended'? Well, cameras are not my religion - there are no sins in using or not using them.
But as far as the serious 'collectors' go, who want one of everything they're interested in collecting, and in pristine condition, to sit on a shelf and merely admire, I say more power to 'em. I can't afford to do that and probably would not if I could, but I believe people should do what they want with their money - if they want to only buy cameras they personally use, do that. And if they want to buy cameras and leave them in the box in a closet, that's cool too. Whatever, if it is your money, do what you want with it. People who have a problem with that just have a problem, IMHO.