The YPN accounts are no bed of roses as many domainers think, especially those out of the US who don't qualify.
I use both G and YPN for PPC. Overall revenue and recent income declines (many have experienced) are quite similar to Adsense.
Since I signed up at the start, yahoo revenue has dropped 90%
That's a fact... the first few months I was earning $x,xxx every month with YPN
Now, with the same sites and the same ads, I'm lucky if $xxx is earned
YPN was a goldmine when it first came out.
*the exceptional businesses of our esteemed moderators