In my case, it's lawn mower, and garden machinery bits that cause probably the biggest problem.
I prefer to keep old things running rather than (or as well as) buying new. But I always want to keep the old thing in case it ever comes in useful, and because I don't know how to legally dispose of it. So it gets put in a box. My shed is now so full of boxes of parts, that there's no room for new lawn mowers.
Solution? I have purchase approval (from better half) to buy a bigger shed.
Dilemma - even if I get a bigger shed, will I still want to keep the old one, in case it comes in useful and because I don't know how to dispose of it.