I think YPN has always had an inventory issue. That is partly why their targeting is off - because they don't have the very specific advertisers like Adsense does. I could put up a page about an aqua-colored-reading-helmets-for-cats and I think Adsense probably has an advertiser for that.
I seek a direct advertising relationship with you for this page. Adsense has been catering to all the big players in the cat reading helmet market lately and leaving little guys like me out in the cold. We have the only aqua colored cat reading helmets, and have been recognized by Cat Reader's Digest for three years running. Please contact me regarding direct banner placement or link exchange ;)