Most people are creatures of habit and are going to use search engines they are familiar with before they even begin to explore which ones give the best results for their type of search. Some people won't leave their home page to get to a search engine...
I don't think Bing is overrated. In your case I think people are not using your keywords to search for related sites on Bing. You may have to do a keyword analysis specifically for Bing.
I don't think it is over rated but ....at this time it couldn't compete with google in any case ,...whether i think your keywords must be not good ones to make you traffic...so work on your KWs.
One of my websites actually received a large portion of its traffic from Bing: it was ranked first for its keyboard in Bing, but only fifth in Google. I think that Bing is actually quite a decent search engine -- both as a searcher and the owner of a website, it has impressed me.
Then what's wrong with your web site? Saying you're a big fish in a small pond makes me wonder why you can't make it in the big pond. If you can't hunt with the big dogs, don't blame the big dogs.
Has a few mostly UI-related innovations, but G's ranking and indexing algorithms are still far superior...
I'm positive that Bing is overrated. Why? They're practically using the same search engine that Live was. The only difference is the name, Bing. I've always liked Google more compared to Bing. Why? Google works on the user's experience.