I have rather a lot of cameras (too many probably...)
My firm belief is that they should all be used for taking pictures as often as possible...
But if I'm honest - 'real life' gets in the way of my hobbies and interests far too much for my liking and, whilst my attitude is quite different to the 'collector' you mention, the sad reality is that most of my cameras haven't probably had any much use than his.
It isn't about not being bothered, it is about time and not having enough of it
Oh well.... when I retire