My problem is that I only buy stuff I like, and then, since it is stuff I like, I can't part with it. I give some away now and then, in the remote hope of kindling a similar appreciation in some other poor soul, but since my wife makes me buy a larger house every ten years or so, there is always another closet. What I really like about this is that I can listen to what I thought I liked thirty years ago, source to speaker, and transport myself back... I think these recesses of the mind would die otherwise.
A few times a year, I upgrade some of my LPs to mint original or collectible audiophile pressings, and take a foot-high pile to our local used record store. I have six very nice cabinets and this is all the volume I allow myself to own.
Be honest-- How many of you deliberately do NOT count how many components you have, and do NOT display all of it at once? Do any of you have a spare linen closet with all your spare turntables on each of the shelves? Not that I do...