I have a collection of 30 plus guitars and use them all at different times as and when I fancy a change.
It isn't as if there is a shortage of guitars, so I don't see the problem in folks wanting to collect them. Some collect paintings, others spend money on expensive jewelry, I like to look at my instruments hanging on the wall and know that at any time I can pick one out and play it for pleasure, or earn money with it which pleases me, so what's the problem? I do agree that it is a bit odd to collect all of these guitars, amps and echo boxes when one clearly can't play, but everybody to their own fix eh?