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Only 20% of our pages are indexed by Bing and Yahoo although we have correctly submitted the sitemap to bing webmaster tools and other search engines index all our content. Do you have any suggestions?

We get very little traffic from Yahoo Search and it seems only 15%-20% of our pages are indexed by Yahoo and Bing although we do submit sitemaps to both of them. Do you have some tips or resources (articles, blogs, books) you could recommend for Yahoo Search optimization?

One of our competitors indexes all searches performed by users on their site. They automatically create new pages/ new urls based on those search terms. Is it black hat technique? Do search engines specifically forbid this?