I've discovered that under certain circumstances, it makes good sense to switch from adsense to YPN...
If you have a site getting low CTR with adsense AND low EPC, switch to YPN. "Low" is a relative term, but I'm talking about less than 3% CTR and less than 10¢ EPC.
I've switched 2 of my sites that fall into that category to YPN and the results are very encouraging. YPN is paying a lot more per click - in my case about 6X as much as adsense! And the CTR is not all the much lower. So the net result is a bigger payday from those sites. Try it.
Since I am closely watching the happenings today as I just changed over a fairly large site from Adsense, it came as a pleasant surprise to see revenue stats are updated every 15 minutes like clock work!
....now if we could see clicks and channel stats as quickly, I would be in heaven!