If both parties have a wishlist pins it becomes an easy one time transaction. I have Addams up for trade. I don't need to get rid of it but it can be good trade bait to someone looking for one. Sometimes people just don't want the hassle of tire-kickers.
In my case I also don't want to hunt for a game and find one only to have it sold just before I grab it. How many times has this happened to you guys? It's easier if you have something specific that the other guy wants.