Well, i yet need to check YPN, because uptil now i have tried adsense but no much of loss has been incurred. But let see how YPN works for me now.
well adsense is a reliable source of income, and certainly better than , YPN coz the ads are more relevent to the content....so the CTR is high in adsence On the other hand YPN pays a bit more thn adsense...i guess thats the only way for YPN to steal some publishers from Adsense....But it is still in Beta phase...and it is available only for US publishers.
when google terminates you they wont pay you. YPN, so far, will pay you what they owe you if they terminate you. its easy to talk to ypn reps. google could care less about you or your problem. ypn reads the forums and has a great rep who will post if its warranted, give advice when necessary and answer the really pressing questions / issues. Google reads the forums and laughs at their publisher problems while they swim naked in the sea of cash they steal from the little man. ypn considers each page unique to your account, while google punishes your entire account for the shortcomings of 1 single page.
YPN for certain of my niches pays twice to three times more than Adsense. Their targeting sucks, but in the case of some of my sites it's still good enough to account for 80% of my earnings. Adsense has much better targeting and a bigger ad pool. But they pay way less than YPN. If the targeting were better (and the damn ad filter worked) I'd move all my sites to YPN. As it is only half pay off better there than Adsense. Work on the ad filter Yahoo!
I think Google adsense is far better. Your ads are better targeted with Google adsense than Yahoo. You get a higher CTR with google. With YPN, even though the payoff is higher, you get far lesser clicks. And Yahoo only pays you for US clicks.
It seems in my limited experience that Yahoo is good at targeting if there are lots of keywords on the page relevant to the advertisements you're looking for, but not if other pages on the site are necessary to target the ads. I've got one site following that pattern doing quite well on YPN. I have another site which gets into lots of technical details about its topic, and most pages discuss sub-topics that don't include many of the main topic's keywords. YPN gets all confused, but Google figures it out.