See, the problem is with the wanted forum (and it’s not the forum’s fault) is that it’s wide open to abuse like this.
Scammer sees someone wanting something, emails with offer of said item and then waits for money to roll in. You don’t have to be a member to view the classifieds and if you put your email address in the ad (al la Mr Hoops) you don’t have to be a member to contact someone.
It is also rather than naive to send money to someone when all you know of them is an email address, and expect them to do anything in return.