Let me get this straight...you're charging in-game currency for a web page design service? Well, it's not exactly RMT but I'm willing to bet that is against the Terms of Service.
"Imagine you’re trying to teach your son to play baseball. You teach him the rules, how to throw, how to swing and when you tell him to go for it, he throws the ball into the side of his own head, runs the wrong way and tries to sell a **** to an undercover cop. Warcraft players fail in directions you never thought possible."