The "wanted" ads are great for miscellaneous items that may be sought after, but not usually found posted. For example, I recently replaced my polycrystal rack's top shelf with a large acrylic base for my new turntable. I shoved the polycrystal shelf into the closet not thinking that it was worth posting an ad for. A couple weeks ago, I saw that a member posted a "wanted" for a top shelf exactly like the one I was storing. So, I sold it to him and both parties are now happy. Worked for him; worked for me...so, yes they work! I do feel that $6 is a bit steep for this type of ad, though.
