Well, you can choose right now to show text only, image only, or text / image combo in each ad spot. From what I see, the off-topic ads are only images - not sure about CPMs since I still can't use it in my AdWords account. But the point of the matter is that in the past, Google has released changes to AdSense, gotten a lot of negative feedback, and reverted the changes.
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The Queen of DaniWeb
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