I don't think people outside the US understand how large Craigslist is. I spend 1 hour, each work day, looking at the national OMPL gig feed after its been filtered for charity/stupidity/things I don't do, to see if I can pick up supplemental clients between larger accounts.

The amount of spam and high expectations / low financial reward is high, but a lot of my small business contracts are from Craigslist.