I worked very had to bring a lot of traffic to my site and it worked, I almost doubled number of clicks but EPC dropped significantly so I doubled clicks but have same or even less earnings. The earning drop was about 1-2 weeks ago. Did anyone had sudden drop in EPC ?
Bringing traffic to your site is not enough -- you have to bring interested and quality traffic. One of my sites received some links at high profile sites, and the traffic was TERRIBLE. That site dropped from 5.5 page views per visit to 2.5 in one day (no one was sticking around). Of course no one clicked either (which is good since they weren't interested) because my links were at the bottom of the page. I don't go by impressions number, I go by how deep the average visitor goes and use THAT number to see if my income per visitor is good. That number is more relavant.