After a year using AdSense I'm believing Google is going to pay lower as your CTR is higher. I know, if CTR is low surely in AdWords the CPC will be higher, and so on. But lately I have read too much about AdSense, as for example the Smart Pricing, and for this reason, and seeing my stats, I think is maybe a relationship between eCPM and CTR. Could someone say he can win lower CPC as his CTR raise? Please, I know I have too little data to say that, so I ony say this could be a possibility, I'm not saying I believe this .