how do these traffic sites work?

Traffic exchanges work on two extremes. Either you'll find great success or great failure. And that truly depends on how you approach them. If your not looking to load your exchanges with referrals than you'll probably want something that gives you more rewards as you go. I have a blog with a few brief explanations of some traffic exchanges. And also you can find another page that will explain to you how they can benifit in the long run. Hope this helps. http://dollarprophet.blogspot.com