Wanted ads are a bait to some of these people. One additional thing I do is when a seller sends me pictures I reverse image search them in Google to see if they have been scraped from the web. Happened to me when I was looking for a specific record for a friend's birthday present... seller came back to me saying he had a copy and sent me pictures and a PayPal address for payment... quick search in Google images and hey presto they were taken from Discogs... I quizzed him as to why and he never got back in touch. Funny that.