I was wanderin what should be CTR and eCPM ?? i mean less the some percent or if its more they ban you or somethin like that. plz let me know thanxxx
There is no correct answer since it varies greatly by the type of site you have and the topic. Forums and other sites with a lot of repeat visitors tend to become ad blind and the the CTR will be lower. Very focused topics can have a much higher CTR. Some people would be happy with 1% - while others see 50%. Earnings will have huge differences depending on the keyword. Personally, I'm pretty happy with any CTR over 10%.
Google doesn't ban you for any reason as long as your clicks are legitimate. If the clicks aren't legit, then they'll get you -- eventually.