My forum is a niche community which gets maybe 500 views a day, and I'm lucky to get a click or two for about 5-10 cents. Yesterday one of the posts got picked up on digg, reddit, and a few other social sites and my impressions skyrocketed to over 50,000. I had two clicks worth in the ball park of $3.00 each! Not that I'm complaining of course, but I wonder if it has something to do with the same i.p. addresses always accessing the content vs. a bunch of fresh faces. Just musing I guess!