Cofounder of thumbtack here. I think you misunderstand our business model. We don't hire anybody; we're just a marketplace. A request comes in, we connect it with qualified professionals, and then they bid directly on the job.

At no time have we gone out and hired "MBA students or aspiring actors" to fill our provider directory. From day one all of our providers were actually working in their industry prior to signing up with us.

Further, I would say that we don't have the same quality problem that Homejoy does. If you submit a request on our site, you'll get a choice between several providers at different price points and quality points. You choose the provider. Poor providers will get low ratings and will either have to lower their prices or exit the system.