Has Niche Dating gone to far?

I was reading the article "Niche dating websites help picky singles find love" at Canada.com and it got me wondering if some of these niche dating services have gone too far?

Don't get me wrong, a lot of dating niches work with most of them being based on religion or your ethnicity, or even popular interests like pets. I just have to wonder about dating sites who service niches like people who are interested in pirates (see press release). Where is this going to end? I'm sure there are people who are passionate about pirates and pirate history but I have a hard time believing there are enough singles out there so passionate about pirates that they need a dating service dedicated to them. This would be like someone creating a dating service for astronauts. Sure there are single astronauts out there but not that many. From 1978 to 2003 NASA had only trained 237, how many of these people are single? Who cares, let's start an online dating site!