You just have to try to sell anything of value online to see this.
I had a comic book collection I was selling a year or so ago for £1300. The amount of scammers who contacted me was horrifying. One guy spent days telling me how his mate would come get them etc and would obviously then have just claimed they had never been delivered and claimed his money back. Obviously not being born yesterday I said he could come but he would be paying cash, and he then spent days messaging me nonsense until he got the message I wasnt going to bend.
Bizarre, its not like comic books are easy to sell on.