Well I own 10 rather expensive guitars. 8 of them are in Argentina, and Ive been in mexico for over 3 years (returning next month to argentina). I dont buy them to sell them later. I play almost all of them (I always rotate the guitars I have with me in mexico, sometimes Ive got up to 4 here and the rest in argentina).
Anyway, I cant speak for other people, but I collect or make custom guitars, because I love them and care for them. They are not only tools to create or play music, but also objects I admire. I would never have a guitar that I wouldnt play.
I dont see whats the problem about owning several guitars if you can afford them. Even if some of them get played only once in a while. Mind you, Im not your regular collector, I have a jem10 and I play it like any other guitar, and of the 10 guitars I own, 5 of them were my own designs.
So, at least, thats what I have to say.