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They should also have data on how many times there are returning users vs. new users. They should be able to analyze that data in deciding how often to rotate ads.
Only hope that we could build high quality websites --> more traffic --> Adwords advertisers would get high ROI --> More Adwords subscriptions --> more ads in the Adsense inventory.
Obviously for Adsense its a compromise between number of ads available, and relevance to your site. If they reduced relevance requirements you would get off-topic ads though maybe more rotation.
Bottom line, is Adsense is restricted by the ad inventory available! Hopefully potential advertisers visiting your site will click on "Ads by Google" and sign up - then you will have a good chance of their ads appearing on your site.
I guess you should be thankful that you are not getting a lot of non-paying public service ads like others!
But overall I'm very happy with adsense. I think it's a wonderful program. But it is still in its infancy.
Perhaps it's about lack of advertisers for the subject matter but I don't think so. I've some creep in there from time to time that would fit and get a lot more clicks if it were shown more often.
I hope AWA (the "new" Googleguy) is watching and lots of peeps provide feedback on the program. It is the best thing I've seen out of Google for quite some time and I think it can grow into a huge juggernaut and am happy to be part of it in a small way (as a publisher).
I also hope they provide more tools for the webmaster to cater the ads and how they are displayed. I think the current layout is ugly.
As for statistic data, I think we, as the publishers, are in the second priority of Google. The first one should be those Adwords advertisers. Google would try to provide more data and options for them to keep them happy and get satisfied ROI. This would indirectly benefit us too.
I agree with you that they kind of should. But their approach to this is very much as the one calling the shots. You like it, fine, you don't like it, they're ok with you leaving. I don't think they will plan to give us the room to play with that one. And their approach is that PSAs go on pages where either they feel the content is lacking or they can't determine what it's about. Instead of penalizing you for showing an ad on a page you shouldn't, they get "brownie points" for being "good guys" or actually are doing it to benefit some "good causes" (take your pick, dependent on how cynical you are ;)
I would like to know if Google could give us the option to turn off the PSAs by reducing rotating, even showing other little related ads (at least they would be ads, potentially could create revenue).
However, if the visitors would see PSAs, they could have a question mark in head, further it could lower their interest to have further digging the site.
I have to say sometimes those PSAs "function" just like "banned ads", resulting in negative influence for some website, especially business-related sites.
There's also something to be said for ad frequency. Not every reader clicks on an ad the first time he sees it. He may not even conciously notice the ad until he's interested in buying what it has to sell. Take a look at the small display ads in a magazine like THE NEW YORKER, and you'll see the same ads for men's mail-order clothing, European villa rentals, barge cruises, home elevators, upscale garden tools, prefabricated vacation homes, etc. week after week, month after month. The typical reader won't respond to those ads in any given week, but when he suddenly wants to rent a villa in Tuscany, or when he needs to install a home elevator because his mother-in-law had a stroke, he'll remember seeing an ad in THE NEW YORKER--and when he finds that ad, he'll call the toll-free number or write for a brochure.