One thing that I've realized while I was doing this is that duirng the early 90's I must have collected minor league cards because I have an awful lot of them. However, I don't remember buying them.
Like Fleer Excel.
Skybox Pre - Rookie '92,
...and a boatload of Classic issues.
So that's another advantage to getting everything sorted. I'm finding a lot of stuff I didn't even know I had.