Adsense is far more advanced in detecting what your page is about. The ads, in general are more relevant and you'll likely have a higher CTR than Yahoo.
While you can run more than one ad set per page with yahoo, the ads repeat, which also contributes to the lower CTR.
Yahoo has a much smaller advertising base than Google.
In many categories, they simply don't have relevant ads and if so, your CTR can be almost nothing.
Yahoo pays more per click than google generally- sometimes a lot more. You also have to remember your clicks are likely going to be less, so you have to factor that in.
The bottom line: It works fantastic on some pages, horrible on others.
Try it , maybe your sites will do great on YPN :wink:
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