Multi units are cropping up next to the freeways where only poor housing was established. People are just natural collectors. I'll bet I've got one somewhere. I hoard such things like they have real value. What I do is store them in a box and put them out of the way.
Trouble is - they are also out of mind.
I completely forget that I have them at all, when I most need one little screw, or button, or string. Someday others will look at my hoard and love the chance to buy my collectibles.