I'm not sure how you use Craigslist but I've primarily used the site to sell a few big ticket items - and it flat out works. After listing a couple of cars on some larger, more feature rich sites for several weeks without any traction, I listed on Craigslist, received multiple inquiries from day one, and sold within 10 days. Granted, this has more to do with the scale of the user base than the actual product, but I'm not sure you can completely separate those two aspects in this business space.