Has anyone had any experience with Yahoo's network YPN yet?

Here's there FAQ with info on their service https://publisher.yahoo.com/help/faq/

I'd like to give these guys a shot, however they don't seem to allow anyone outside of the USA to join. I wonder when this will finally change. It's extremely pointless in my opinion.

Same here. I am out of USA and I have never tried it before. I heard that it used to pay more than google adsense and is not as contextual as google adsense.