IMO in my area, the majority of customer's on craig's list are looking for a 1 one man operation to take care of their lawn. They are looking for CHEAP. If you are not super cheap, I think craigslist is not for you.
I did use craigslist is in the past for a couple years. I started Craigslist for a couple months this season, had a great ad, got several calls. Most lawns not cared for in years, they want A+ level service for like $30.00 a yard it is ridiculous. Most of them also want service that same day lol. I can't stand craigslist and I don't think I will ever post an ad there again.