Yahoo Answers is great precisely because it can provide a strong source of targeted traffic that is not based on SEO. Depending on the niche and other tactics, many receive as much, or more traffic to their sites from YA than from search engine traffic. 3 out of 4 people get to a site via a search engine search, but the fourth person gets there from a direct link, by first going to a heavily trafficked site and then following a link, no Google involved. This can be very important if a given site is penalized by Google, or an update suddenly changes a site's standing from page 1 to page 100.
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