Sitter City ?

Has anyone ever heard of or used Sitter City? (www.sittercity.com)My best friend introduced me to the website today. People can search for sitters (for babysitters, pet sitters, eldery sitters, house sitters, and tutoring) on there. Also people can post their profiles on there. I just posted a profile so people in need of a sitter can search me. They have a back round check they charge 10.00 to do and I'm just curious if it's even worth it. I'm new to the site and not sure how many people looking for a sitter will really go on there. What do you think if you were searching for a sitter, would you use the site?
I have been searching for a new job, I work in an office setting and I was just miserable. My cousin owns a maternity clothing business and offered me a job yesterday and I took it. My hours are going to extremely flexible and I love kids (I'm going to school to be a preschool teacher), and I thought this would be a good opportunity to get out there and see about babysitting whether the parents need to run some errands and just need me a few hours or if their usual sitter isnt available then I could do it for a day or week or whatever the need is.