I lurk a number of forums for varying reasons, but one thing I have found that I think is great, is buyer and seller feedback.
For the majority of the times, I am sure the transaction through this site are easy and smooth, however, some may not be. For new members looking to buy something it's great confidence being able to look them up and see that they have a good track record, and sometimes it is just nice to publicly say thank you. For example, I just purchased a jacket off Cams, which arrived very quick and exactly as described; and that I would recommend anyone dealing with him.
Opinions?