Oh I couldn't disagree more. I've been on CL since I started my business. Almost 5 years later, I get very little spam and I get jobs from it...at full price. The thee places I get the most exposure from are Yelp, CL and Facebook. All free.
Additionally, you may get a couple who is trying to lowball vendors, but once you talk to them and show them your stuff, they often end up spending more than they had originally planned.
My listing goes in the "Creative Services" listings.