This issue was bugging me for 2 months so those 2 months kind of dropped off in earnings. Anyway here is how to fix the smart pricing issues. Be sure to REMOVE adsense ads on the blogs/webpages on which u have little number of visitors and no click, remove it. Make sure that you dont forget some blogs that u probably have adsense on them, for example i even didnt know that i had 3 blogs on 3 mails which i dont even work on. That fixed my low cost clicks, hope it does to you too.