I have come across a few sites hosting YPN. The ads are very, very untargetted. Google is far superior in this regard.
I agree 100%. I removed their ads from some of my websites because the CTRs were terrible. The ads did not have anything to do with the topic of the websites. I will wait until their ad targetting gets better before putting their ads on my websites.
CTR is terrible, but the payouts are still good. Ad targeting is definitely not nearly as good as with adsense though.
In the long run, its much betetr to have well-targetted ads than higher payout. It is assume higher CTR will compensate for slightly lower cost per click.