In addition to what learc83 said, you can't really feasibly do this. Freelancers end up needing to do more work for the amount of output they provide because they have to pay spin-up costs on every project. This means that they are already disadvantaged, and when you combine that with the fact that they are not guaranteed work, dropping prices becomes pretty unsustainable. It's a big part of the reason that freelancing barely exists in most industries.