I collect Liddle Kiddles and Petite Princess furniture because they are roughly the same scale so I have a couple glass and wood cases made up like little mansions.
OMG, don't get me started on hoarding. My DH started with baseball stuff, moved on to cameras and then model trains. He has nearly 200 complete model railroads. Our spare bedroom has floor to ceiling shelves filled with train sets. He has I don't know how many Rubber Maid containers filled with train sets. They fill his mom's basement, our shed and our attic. He is the manager of one of the largest model train business' in the country. It never ends. When he dies, if I'm still around, I'm donating all of it to orphanages or day cares.