Not to be a smartass, but can you give me some examples of the "plenty of others"? PM is fine. You know not all CL generated traffic has to be bad. Some people use CL for list building since because of the categories, it's easier to find who's interested in what.
Say for instance, I post a CL ad in the autos section, offering a free ebook on how to effectively sell used cars in your state for side income etc. Say on my lander or whatever, in the process of getting this info they also have to agree to get promotional emails. What if I had 50k of these emails and sent them all an auto related offer once per week/month, with proper protocol and opt out options? Is that really unacceptable?