Yes, but does Yahoo want publishers who are unhappy with AdSense? It's more likely that Yahoo wants publishers who are making money hand over fist with AdSense.
It's like anything else:
- If you were recruiting salespeople, would you want the competition's lowest-earning or highest-earning reps?
- If you were a book publisher trying to lure authors away from your competitors, would you go after the authors with poor sales and royalties or the authors whose books are bestsellers?