I used to collect old cigarette lighters, lawn darts, skateboards, jackets, weird toys, old beer signs, vintage bicycles, and just weird crap in general.
Lost it all over and over. Used to have about 70 skateboard decks, mostly from the early to late 80's, that I picked up from shops when I was on tours, or got new. This was back when they weren't worth anything but the retail price.
My apartment (and 80 other units) burned down in 1995, destroying them all. Probably coulda retired if I still had them and sold them off. A lot of them would be worth thousands today.
Beer signs and other large collectables all had to go when I was unemployed and moved into a friend's house in early 2000.
Got to the point of realization that I don't need 20 vintage bicycles. Cut that down to 4 custom ones I liked to ride. And two are for sale.
Still got a pile of lighters. Really fancy ones. Some worth good money. They're in a box somewhere and I use bics.
I've got too many jackets for the weather in southern California. Mostly gas station type jackets. I'm a sucker for a Red Cap jacket with a cool patch.
Now I've got a bunch of moped and small motorcycle engines. Didn't think I'd become a "collector" of minarelli engines, but until I build bikes for them, they're just taking up room in the garage.
For a while, it looked like I was collecting mopeds. The more obscure, the better. Now its just the ones I want to ride, and even 3 is too many. (Plus my race motorized bicycle, my Testi Grand Prix...)
I try not to collect anything anymore. In the end, it's just stuff I don't need, and don't use.