I have to think that when he is saying that he is getting "scammed" is that there are a number of false postings on CL. When you "get no response" (for the most part, not all) the postings are people trolling for email address (email collectors) and sell your good email address off to email lists.
Ever noticed that you respond to a posting and a few days latter you have more "spam"???
I have also found some nice pin's on CL so you have to take the bad with the good...