If you see a fall of your daily incomes, it's because your revenus are not refine over time between blogs. Now they are depending of real daily ads performances on your blog. A click campaign must be clicked to be evaluated, a print campain must be view by a maxium of visitors to let you win more. Some days you will have high earnings' ads while other days you will have ads with lower earnings. It's important to know that advertiser will select your blog from various caracteristics as : visitors volume, blog's thematic, posts quality. The author partnership in the past paid only from number of unique visitors, this solution aren't in favor of all blogs. Now your incomes are computed from your real performance.