I'm very confused what CPM rates to charge for banner advertising. I see a lot of sites are averaging about $5 CPM. On the other hand, most big IT sites (Devshed, The Register, The Inquirer, etc) are charging $10 to $50 CPM. Am I out of line asking for $5 CPM to $16 CPM depending upon the ad position, size, and how targeted it is? Is $16 CPM out of line for a forum regardless of features such as forum-targeting, frequency capping, geotargeting, etc.?