Just from my own experiences, in selling and buying, I know a lot of people skip the GPA all-together and just price books in the ballpark of what is on Ebay. Most of the time those prices are "negotiable" which is why you see price cut, after price cut. As for the contributing to the boards portion of the discussion, I think a lot of people find these boards and think to themselves "oh great! a place to sell my stuff and not have to pay fees to ebay!". It will work for some, but with so much competition for the front page at times, a lot of these people will move on. Then there are those like me that read these boards on a daily basis, but only occasionally comment. I like to look at the pretty books