What do you collect?
Mobile phones. It's an occupational hazard. :) Over the years, the technology and the needs change. The result is I end up getting new phones. Sometimes I'll go several months without getting a new phone, then all of a sudden, I'll get a whole bunch at once. This past year was a goldmine.
I pretty much save all the phones I've ever had and give them to people who need a new phone for one reason or another. Nice to be able to save my friends and family some cash.