The only time I find paid inclusion of any real value is when you have a site that is updated on a regular basis and needs to be re-indexed every 48 hrs.
Keep in mind that Google and Yahoo! are 2 different search engines...with 2 different algorithms. Optimizing for one, may be harming your rankings in the other. But if I would have to choose between which search engine to optimize for, it definitely would be Google, as they have about 52% market share of searches online and it seems to be climbing.
Continue to write and update articles, refresh pages with content, as well as continue link building using your anchor text and you should get your sites picked up again through Yahoo!.
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