Seriously? How would the small staff of SR monitor and catch scams before they happen? That is asking the impossible. This is an anonymous marketplace which is open to anyone and everyone. The staff is not psychic - they don't know what some anonymous individual is going to do or say until they do or say it! They can't prevent scammers from scamming via the message system. They put the escrow system in place in order to protect vendors and buyers alike. They investigate scam claims on a daily basis and take care of those accounts as quickly as they are able to identify them as scammers. Beyond that, everyone is responsible for keeping themselves safe too.