Most companies that buy things, have an "Approved Vendors" list for any given component that must be outsourced. Approved Vendors lists need to be product specific, and there absolutely must be a clearly defined criteria that a vendor must meet to be placed on the list. Conversely, there should be a clearly defined criteria on how an approved vendor would get dropped from a list.

In the case of this site's Market, products should be divided into general categories such as Templates, see more modules, hosting, coder for hire.... etc, and you could maintain an approved vendors list for each category. In that way, customers will better know what vendor is best suited for a particular product or service. In other words, a vendor on the list of approved vendors for templates, may not necessarily be the best person to go to for modules.

Yes, it's a bit more work than what you do now, but all that spare time you have on your hands is probably driving you nuts anyway.