This seems very similar to the now defunct grubwithus. I tried it in the early days and it was great but it suffered very noticeably from the Evaporative Cooling Effect [1]. It was very noticeable after about a year that the quality of people was much lower and I evaporatively cooled myself out as well. It's a huge challenge with models like this to avoid that problem.

1: http://blog.bumblebeelabs.com/social-software-sundays-2-the-...