These three sites have a huge discrepency in revenue/1000 impressions even though they are pretty much the exact same site. Here are the stats: myspacetoolbelt.com: 2800 impressions, $4.25 (approximately) myspacefunk.com: 950 impressions, $7.70 (approximately) myspacebold.com: 930 impressions, $7.00 (approximately) How could this happen? (Note: This is not just one day of stats. These stats hold true for a span of many days)
Also a huge amount of keyword stuffing happening at the bottom of the page on site 3 could be making the targeting more on point. Not recommended in the eyes of the search engines though.