Aren't there already other apps meeting this need? The problem with a "directory" format is that it lacks personal depth. I've never gotten a qualified business lead from a directory (and I'm listed in several thanks to some certifications I've earned int he past). They are always looking at the rate and keywords rather than "Is this person good to work with?"

At the end of the day, personal referrals are the way most people do business. It's inefficient, yes, but so far I've never seen a suitable replacement.