Hi, I think most of the image ads are cpm ads in adsense. So why put a banner at the top of the site when we earn only for impressions and not for clicks? I think it makes good sense to put image ads at bottom of site (where it wont distract users) and text ads (which are CPC mostly) at the top of the site, where users will see and click. Please correct me if I am wrong!
the information is 50% true ( and it is old news) . as not all Image ads are CPM . From time to time I get Clicks with 1$ each .
First of all, I wouldn't even bother about using image ads since most of them are cpm based. It's like selling your web space for cheap ads.