I was always under the impression that if you have more than one adsense block on a page that the block which appears first as a spider would read it will have ads with higher CPCs. But I have found that on my site the ad block which appears 2nd in the code gets almost twice as much per click on average (sample size is in the thousands so the evidence is correct). Do the CPCs differ for ad formats? I.e does a 468x60 banner always make more per click than a 120x600 sky?r The sky has a CTR that is around 2 times that of the banner if that makes any difference.
Sounds interesting, might have something to do with the actual ad unit? I have never purchased adwords, but it is probably possible for the investors to chose which kind of ad unit they want to bid on? That's just my guess I'm probably miles off the mark
Yes i do use channel data to figure this out - i would never click on one of my own ads. As far as I can tell no image ads ever appear on my site so I don't think it is this. I am an Google Adwords Professional and can tell you that advertisers do not have the option to choose which ads to bid on (unless they are doing a site targeted campaign but I don't believe a 468x60 banner is one of the available ad formats for this). Anyone else ever experience the same thing?