I bet I've scared off a few people on accident now that I read this OP lol. I live 10 minutes from a guy with 30+ Jeeps in his yard for parts and I link people to his Craigslist ad all the time. He is 100% legit but, oops. Haha.
I think if they blocked out nigeria and a few other countries it would reduce the issue. I know that my WTB scams were foreign for sure.Sadly, the bigger a site like this gets the larger target it becomes. When I helped admin on another popular forum it was dozens every day. Finally had to go to full manual approvals and IP checks. Disallowed proxies and sketchy VPNs, but a few would still slip through.
Remember the old adage. If it's too good to be true...