Ofcourse it is very stupid to mention a replica site in a paypal message. But this guy probably stumbled upon rwg saw your name and site and ordered a watch. He really has no clue how these things work. All he knows is, he wants that watch and he wants it now! If People can go to your site and without any explaining can buy a watch with paypal, these thing will continue to happen. You have to invest some time to teach them how it is done the proper way. But thats just my 0,2 cents.