CTR may depend on many things like niche, ad placement, impression, visitors level, at low impression sites CTR being high, At normal traffic sites CTR between 1.50% -3.00% is normal and pays good. At high impression sites CTR being around 0.50% . I have been with all kind of situations so don worry if you diden and thing illegal according policies of adsense. Or you can contact to support department regarding this only they can give best answer. Between can you give URL of ur site?
yeah.. high CTR = low returns... only 2 - 3 people will visit that site everyday... but atleast one will click on the ad.. it pays me $0.01 with very high CTR. and yeah... u guys can have a look at the site, coz its just an educational.. and its hosted on googlepages. http://cetexams.googlepages.com/index.html