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You'd think that this would be something that Google could wip together in a matter of hours, but I guess it all comes down to priority. They're probably spending all their time trying to perfect the the algorithm.
I believe we will see a variety of new features released sometime soon, and hopefully this will be offered in the next batch of publisher goodies.
"Currently, we are working on a feature to allow you to track different sites through your one account, however, at this time the feature is not available. We would prefer that you maintain one account for your websites and utilize this tracking feature when it becomes available."
i would imagine that if say 5 out of 6 sites are doing well with adsense, but one is doing very poorly, the webmaster might wish to get rid of the adsense ads on the site that isn't working out, and replace them with some other form of advertising that might work better. that's about the only reason i can thing of - short of just plain ol' curiosity.
If I know one site is doing badly compared to the others, I can experiment to find out why and improve things, or investigate alternative revenue sources.
If I know one site is doing well compared to others, I can invest more time in getting more visitors to that site rather than the others.
In other words, knowing AdSense metrics broken down by domain gives me the information I need to better allocate my limited resources for a better return on those resources.
Just curious. What would you all do with those detailed of stats since you can't change the ads that show up? Is it just to know what's going on?
Testing colour schemes is one purpose. I'm currently 7 days into a colour change trial which looks as though it's increasing CTR. But I had to implement it on all of my sites to get consistent data.
Experimenting with different ad formats is another. One guy at the WebmasterWorld PubConference in London last Saturday told me that the banner ad format out-performed skyscrapers considerably. I'd like to try this on one of my sites and be able to measure the effect.
Sure, information on its own isn't enough. It's what you do with it that really makes the difference.