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Its out of our hands
We can only block ads we don't want to see.
But I see where your coming from, and why you want to have these particular Ads which you feel work well to be there all the time, but that's out of our control.
Also, if one ad is clicked more than others does that increase it's chances of coming up each time?
Others with Adwords experience may want to add to this.
Thats not possible now.
What I would like to see is for Google to allow publishers to place a link on their sites "Advertise Here"
The link will go to a page that describes running ads on your site through AdWords, and how advertisers can sign up for AdWords with Google and choose your site as one of the sites to place their ads.
As an AdSense and AdWords user I would like this feature. For this to work Google will have to update AdWords to allow advertisers to choose which sites to run their ads on.