Relatively bad CPM for September so far. Adsense CPM and CTR charts.

Traffic is picking up (don't know why btw), CTR is shooting through the roof, but eCPM is hovering way below average. What does this mean? Either people prefer to click on cheaper ads for some mysterious reason, or I'm being served cheaper than usual ads for another mysterious reason. Either way good traffic does not bring in significant Adsense income increase. Sad. I'm still getting around $9 a day for the whole September, forget double-digits I was able to show in August.

Here are the charts of my Adsense CTR and eCPM since the beginning of August (without numbers of course) - did I tell you this is a roller coaster?