Just my opinion...
I don't care about GCs, and actually think they are fine. What I would like to see removed are the "W: Offers" posts. People should list what they are looking for and the ratio they find acceptable. Even the "H: 100k SPG W: AA" are annoying if there is no indication of what the poster is asking for.
One thing I did find interesting was my last CC post where I gave away 3 club passes (W: Karma). The stipulation was that whomever requested one needed to show me the link to where they gave something away, so it was kind of a pay it forward type model. I actually was able to give away all three within a few hours, so there are still plenty of good CC'ers out there.