Did you vet for quality/capability?

What I'm afraid of in this space is that you're going to have a mix of (a) unaffordable good ones and (b) cheap, less capable people.

It depends on location and opportunities but half-decent freelancers tend to be over $100/hour where I am (New York). People will work at a lower rate for good-citizen reasons (and because they care about the technologies, want to meet new people) but that component is limited and will never get to on-demand service.