In all the years I've using CL and Ebay, I have had exactly 2 problems.
The first was for a seat for one of my old Yamaha's, I won the Ebay auction, and never received the seat. Ebay recovered my money for me after 60 days.
The second was one of those "I wouldn't touch this with a ten foot pole" deals on CL, it was a listing for a 2005 Speed Triple within 50 miles of me at a really nice price. I emailed the seller, who emailed me back stating he was doing missionary work in Africa, but if I sent his wife my phone # to a very strange looking email address, she would send me more pictures so I could purchase it. Umm, no, I don't think so Tim! I'll buy it after I see it and hear it run.