I think this is a horrible change. While the concept is great, the reality is that the depth of yahoo relevant ads is so thin that it is causing completely non-relevant ads to show just so "unique ads" will show. This non-relevancy not only caused a drop in the CTR, but caused a large drop in the payout per click as these "unique" ads pay far less. I'm busy converting a lot of my sites back to adsense. IMO, YPN should have waited until they had the advertiser depth.