I had a call from a recruiter once, asking if I would be interested in a Ruby on Rails position. I said no, that's not what I'm looking for. She then asked me

I had a call from a recruiter once, asking if I would be interested in a Ruby on Rails position. I said no, that's not what I'm looking for. She then asked me to explain what Ruby on Rails was, how it related to other technologies and was it popular because a lot of people seemed to be asking for it. Of course I explained the best I could, to make the world a better place and all that, but it seems (as other commenters have pointed out) that there could be a real niche for techies to run a recruiting firm that know what they're talking about.