In the internet dating space, bigger is not always best. According to the latest U.S. numbers from Hitwise, the top niche dating sites are steadily gaining market share while their big mainstream counterparts stagnate.
A great post today on Techcrunch about the growth of niche dating as other general dating site growth stagnates as they battle for market share:
http://www.techcrunch.com/2008/04/24/niche-dating-sites-grow-steadily-as-mainstream-ones-flail/