Could you please elaborate for which particular markets YPN outperforms Adsense?
With very limited experimentation in travel niche, my experience with YPN has been poorly-matched ads to site content, subsequently low CTR. However the RPC in most cases was higher than Adsense. I have observed and suspect -- but do not know as a fact -- that YPN does deeper analysis of visitor history, subsequently the apparent mismatch of ads -- ads may be displayed more closely matching the visitors surf-n-search history as opposed to present site content.
YPN provides excellent *personal* customer support -- a real live person on the phone, holy cow. And I always get fast, on-point email response from Google Adsense.
The good, the bad, the in-between doesn't dissuade me from planning on increasing YPN adverts in the near term, mainly for an opportunity to conduct better analysis and comparison with Adsense. No downside to having options.