There is a Buyers Section and a Sellers Section and ofcourse the Service section....
Now that the obvious is out of the way
I think adding a "Trading Section" may be nice.
I went to post a topic earlier to trade an AutoCrabber Auth for another auth, but I wasn't sure whether I should classify that as buying or selling since I am technicially trading.
Also, we could create a "Subforum" within the trading section for "In-Game Trading" So people could post what they want to trade in game as well.