My interpretation of a "Guitar Collection", is a quantity of Instruments being cherished & adored, but rarely played. A working musician, & I class myself in the catagory, having spent 35 years both Pro & Semi pro, can easily amass what seems like a collection, but is actually a "Set of tools", used for various textures as and when required. As Bigsby said above, if you need P90's, got it, need a Semi acoustic, got it, Etc, Etc. I currently own, & use on a rotational basis if no "Specific", is required, 13 Instruments of varying styles & value's, yet, I'm playing less than ever, as most gigs now are at best "Average". A symptom of the North East publics attitude towards "Live bands". However, I do know of a LOT of guitar players, who play occaisonally, that buy & sell guitars, like I shop for food.