All though it is hard to get sites approved for YPN, i do believe they have great success with content based sites. Yahoo looks for certain aspects in order for them to approve a domain. Here are some of the requirements they look for:
-Contact link, about us link, terms of use link, privacy policy link, etc
-They don’t approve spam sites like celebrity sites, they want sites with rich content (news sites do really well)
-They want to see over a 3% ctr on the ads
-The list goes on and on. One of their requirements is, “A site that is general well done and good for our network” or something vague like that I can’t remember the exact wording.
Besides, there are better programs available that are powered by Yahoo and are easier to get approved with and pay better than yahoo or Google. If you want some suggestions on who I’d recommend send me a PM and I’ll chat with you about the best possible fit for your sites which I know Yahoo allows
Regardsless of what program you decide to employ, the results will still depend on whether the traffic from these programs would decide to use your site as there are other more popular and well established sites. Be ready to offer more than the usual service - thats how you get users
CPXIntrective 
