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Does anyone know how Adsense works? Will Google serve Adwords regardsless of how many pages of a site a visitor has seen before? In other words, if a user clicks on 10 pages about widgets, will Google display targeted ads on all ten pages, or just on the first five, and then serve public service ads? Because... if the latter is the case, it might make sense to save those impressions for those pages that are known for good clickthrough rates, and put different ads on the other pages...
There are various ways however to optimise for Adsense, based on very good guesses and the info they provide already. But i think google is trying to keep that to a bare minimum.
I would advise against creating pages and sites 100% optimized for Adsense. Google can change the rules at any time, and then we will start having those "google is taking food out of my babies mouth's type posts", if adsense reaches any critical mass.
My main question was: Will those adsense ads wear out, and after a user sees 5 pages about widgets, the sixth page won't have widget ads on them anymore because all widget ads have already been shown? Or can you view 100 pages about widgets on the same site, and the 100th page will still have the same widget ads on it, just like it would have been the first? There's a fundamental difference between these two systems, and I'm sure there are people in here who already know which one applies.
I should have stopped my prevous post at "Not that i know of" ;)
Adwords advertisers can set maxmum spends a day. As that max spend is approached their ad may appear less as a percentage. There are other ways that the ads can disappear and reappear, but im only talking about the Adwords side; i dont know whether adsense applies additional "filtering" and if they did, i dont think they would tell!
As far as I can see, when they have targeted ads, they appear on the appropriate page, and not on others.
If someone has bid for "green widgets" and you have several pages on widgets, but only one page on green widgets, then the tageted ad will appear only on the green widget page (all other things being equal, which they scarely often are)
I have followed it through on hotels, and that seems to be how it works. In the end it depends on what the advertiser is paying for - they call the shots (and rightly so)
Interesting to see how Google goes about pruning (expelling) content sites
So you could safely put adsens on all your pages. But it may be worth making sure each page has a slightly different focus, not jsut for more varied AdSense display but aslo from a SEO as well as usability point of view.
Based on what I saw, the ads do rotate. However, I assume that it would depend on the ads inventory and whether Adwords advertisers change the bids. If your keyword would be a popular one, you could get enough Adwords to rotate. Otherwise, you would see the same ads over and over.
I wonder if the answer to yosmc's question could somehow be related to the "theme strength" of your site.
If your pages are all about widgets --red widgets on one, green widgets on another, blue widgets on the third--, GG could well show the *same* ads (about "widgets") on every page of your site. (Of course, if there is high interest in "red widgets", etc., resulting in sufficient ad inventory for each of the individual color combinations, things may be different.)
However, if your site has pages about widgets, gadgets and... (whatever), the ads may be *different*.
Related to that, if visitors see *several* pages of your site, they may be more likely to develop some sort of "AdSense blindness" if the ads are all the same; but *less* so if they keep seeing *different* ads. ("Curiosity/surprise" factor?)
If I bid for a keyword of one of your pages, an insane high CPC and per day limit, it will ALWAYS show on that page as first ad for EACH impression guaranteed.
If you get a "rotating" effect on your pages, it maybe that the adwertizers in that niche cannot afforrd a high daily limit and thus cannot ensure to be displayed on each impression.
Also, Adwords advertiser could set geographic target and different visitors from different locations would see different ads.