I did for a lot of years, but more for personal enjoyment than anything else. After a while though my collection got so big I had to sell a lot of stuff off. Eventually I got more into bobbleheads (I know, weak, but I couldn't help myself) and collectible statues. If you want to buy some really amazing statues that always seem to go up in value check out
http://www.sideshowtoy.com/...