These are items I have duplicates of, and the first things I'd like to trade. Basically, if you have something different of similar value, and I think it looks interesting, I'll probably accept the trade.
This is stuff I'm willing to trade for other things I want, but still stuff I like having.
This is stuff I have (of varying value) that I don't really want to trade, but may be willing to offer to help get things on my wish list.
These are items I've seen that have caught my eye that's I'd like to try to trade for. (P.S. Guess my aesthetic.)