Really it would be just some items that fell under "memorabilia", while like you said comic books or sports cards are memorabilia, but condition matters a great deal in those niches.

Even within the game used hobby the more gmae use does not always equate into more value.

For example, look at locker nameplates. IF some player marked up his nameplate (without documentation of coarse) to wear the name is barely legible, it likely wouldn't be worth as much. But if it was documented some how, then that is another story.

Or another example is on the lower tier game used items. Some people would like to get a game used jersey from their favorite team for $50-$75, in that case they are more concerned with fit, comfort, and/or style. A dirty jersey probably doesn't interest some bueyrs as much on the low end items. Those buyers are not the same buyer who is getting a hammered Adrian Peterson jersey.

Also, look at game used bats. I am not a huge game used bat collector, but the more use a bat has (from my point of view) would mean that a cracked bat shows the most use. However, a lot of bat collectors want uncracked bats, however showing heavy use.

This hobby isn't an exact science, as many of us have expierenced.