Although I only have been using AdSense for only 2 weeks now, bringing in an average of 50 cents / click, one day I had over 100% CTR. I suspect a competitor may have done this, but can only guess. For the past few days now, my earnings per click have decreased 90%, and I am consistently making less money. Is this the result of Google's algorithm blaming me for these clicks? I filled out Google's online AdSense click fraud form yesterday, but haven't heard back and continue to receive a penny or two per click now.
If your stats are low (ie, very low number of impressions) then CTR isn't really all that useful of a statistic.
bad luck but low traffic sites have low paying ads my acne site is low traffic but it has high paying ads
No one really knows how Big G does its business regarding this type of stuffs and its so hard to decipher how they come a certain type of ads or how to apportioned those low and high paying ads. Too many theories about it. I just hope it can be more transparent Just my 2 cents JulieV