I can see the benefits to this type of marketplace, but I'm unclear as to how this is appropriate for me, a content writer. (You included content providers at the end of the post.) I'm not selling traffic, I'm selling articles and web content (and there is no such category anyway). Do I create a listing each time I want someone to buy my content? Like, okay so someone bought my content, now I have to make another listing so someone else sees it and buys? I can't even specify a price in my listing because it varies depending on how many articles the customer needs.
I see how this provides accountability, but unless I'm missing something, I don't see how it provides any more accountability than already exists in the BST section. A person's reputation is reflected in their Itrader, reputation scale, and the reviews in their thread. Of course, a scammer can always make another account and start again after screwing someone over, but I fail to see how they couldn't do the same thing on GoTraffic: just make another account and start over.