I do landscape design, which isn't part of the craigslist cheap market. The first few ads I did sucked the life out of me with stupid, dead-end calls.
So I put my pricing IN THE AD. I'd rather get three calls ready to pay for my services than three hundred who think I'll come do a free design. Why are we all so afraid of putting our pricing out there? Most of us haven't figured out some awesome trade secret. If you want to screen out people who won't pay your prices, advertise with your prices.