I regularly post auto parts and other things online with CL. It's frustrating enough dealing with the local flakes. It's almost entertaining to get bogus email from scammers since they can be so blatantly obvious.
I always insert an invisible HTML code that you can get for free from
http://statcounter.com/. It has various tools for your ads. With that I can tell who and where people are looking at my ads and even the date and time. So when I get these bogus emails, I'll check the date and time and match it up with the stats. Guess what, every time it's been from Nigeria.