I use sewitsforsale often and have never had a problem. As for coming to look at something I would never do that. We had a lady in our town raped by someone from Craig's List coming to look at a car.
Now Ebay is another story. I was scammed out of $700 and Paypal did nothing. I wrote it off on my taxes. I sent a Bank Check to Florida and it was deposited in FL and withdrawn 15 min. later in Brazil. The FL dectective told me to stay away from buying things in FL. He said it happens often. The guy who scammed me got 5 others the same day. They have since arrested the man who made the deposit, but I doubt there is any recovery involved.
Probably more than you wanted to know.