I'm both an avid an terrible collector.

I have old video games, books, vinyl records, toys and card games. My girlfriend would probably say I hoard stuff.
And that's true in the sense that I just keep things I find interesting more than I add them to some collection.

For instance I have all manners of weird little Star Wars paraphernalia. Every time McDonald's or Kellogg's etc have some promotion with a Star Wars item, I keep it.
But they're just laying around, I couldn't tell you where that miniature Star Destroyer with a suction cup came from or how long I've had it :-)