I think people who are into crafts. They have all of these yarns, construction papers, various tools and stuff. All so that they can say that they have all of these projects in mind that they want to do. But they never do them so they get more crafting stuff and it just eats away storage until their place is practically consumed by it.
I have a friend who is a car guy who owns both a scrapyard and a storage lot due to the fees he was racking up with his hobby.