I don't know, I have pages who do between 20 and 30% everyday and haven't had any trouble with Google because the clicks are legitimate. I don't know what to answer, why not asking this same question to google and tell us the answer they give you?
I guess I don't really understand this thread. As long as your CTR is obtained in a legitimate way, it can be considered "safe." As far as which CTR is better for earnings, the higher your CTR, the more money you will make.
10-15%? I wouldn't worry too much unless my CTR was consistently 30% with 100 or more visitors each day. That's 30 clicks each day with only 100 visitors. The best page CTR would be 1000%
Depending on your website category If you are having forums less then 3%... However I knew a guy who was having around 30% CTR rate, because he put his adsense on the top of his pages ... and he was ranking very high on MSN for lot's of keywords, and there where no problems with it... It's all depending.. CTR is not a problem, but don't try to cheat Google! google got an anti fraud software based on IP classes So if you are having a CTR from 81.196.91.* at 100% (and 100 clicks a day) and from the rest of IPs only a CTR of 0.1%... they will ban you Also they also make diferents CTRs from diferents counties... in that way they may ban you , if you ask all your high school friends to click on your ads So if 100% CTR from Oradea,Romania ... then you are fxxx up ! Hope you got it! it's only an example!
They should send warning e-mail instead of banning people right away. What happen if you ran on a few buddy who ask about the ads on your website, and without telling them to click on your ads you explain how adsense work,if they choose to visit the ads from your website on regular basic and they're all the click you get in one day? What a legit click from google?