Only % CTR will not be problem , If you also get 40% CTR it will be fine unless you get invalid clicks . So worry about invalid clicks if also CTR is under 10% . So if you are not getting invalid clicks then there is nothing to worry about. You should be happy for getting higher Ctr . CTR generally depends on type of site. If your CTR is suddenly jumping then think about it other wise don't worry about it . Go and celebrate it !!!!!
Thanks for detailed reply .. well , how i know about invalid clicks ? Usually if i suspect jumping with my CTR I do report it to adsense hoping that it gives them good impression to clear my side with these clicks .I'm not sure if adsense consider my reports and if it really shows them good intention ..
Nice question, usually people are asking about how to rise the CTR . If the clicks are genuine than you should be happy and without any worry.
I average 3-4% CTR. and As far as your clicks are geniune there wont be any Proble. The Ideal CTR is around 4 - 5 %
I have read somewhere that on average internet advertising is approx 1% to 3%, however I get somewhere around 1-2%