i looked at this space/concept a LOT years ago. lots doing .. nothing made it. except for fortune tellers on keen. even google closed up shop here. Q&A markets are free on yahoo because online non-social info is free and low value. high value stuff is service provision (ie. doesn't scale in time) and the good people get good rates w/out messing with internet customers who tend to flake out (just try renting an apt on craigslist). i don't see a way this works, but sure is a great idea.