You could be creating individual profiles of every surfer who comes to your network, and be sure they receive the most relevant content based on their surfing history. Don't just blindly buy the traffic, try it (succeed / fail) and then buy more; you need to learn from it and make constant changes. I suggest developing surfing patterns and making better content decisions. Buying traffic is part of this business good or bad, but if you are smart with what you buy it can return dividends to you for a long time. Use the traffic don't have it use you.
It's a new technology and maybe a little hard to understand at first, but you should take a look at
http://www.clicktruth.com/