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Yahoo, Bing, and DuckDuckGo may slowly take a bigger piece of the market in 2015. Yahoo is the default search engine for Firefox. Safari had a deal with Google, which is supposed to end in 2015, and Yahoo and Bing are both trying to become the default search engine for the browser. As other search engines become the default Web browsers instead of Google, it makes sense to optimize for those search engines as well.

I agree, the more search engines you optimize, the more success will the site have. It's easier said than done but it's worth giving a shot.

The difference between the search engines are very small. The most important thing is to be sure your site is indexed in at least the big ones. Normally they will eventually find your site, but if not then submit your site to the index (Google, Yahoo, Bing, Yandex etc.)