Biggest problem which i have ever faced in Adsense is when ever i get more impressions of visits my earning is low because i get less click rates and if i get less visits or less impressions my earning is good and has good click rates too means for example : when i get 500 impressions in total earning is 10 $ ok and when i get 200 impressions my earning and click rates goes up and its shows 57 $ and the channel shows means the location or the country is also the same from where i got click from .... why does this happens ....
low CTR for Fast traffic, cause it is low quality, i mean if you drive traffic suddenly from forums or anyway it must be low quality because of they came there to read that viral news not buying something.