If bitcoin is ever to be widely accepted as a mainstream currency, it would be better that the critical nodes (exchanges, online wallets etc) stay above the law. Intersango closing OP's account will present absolutely no problems to OP if he wants to continue trading on SR (apart from the immediate problem of getting his money back). It's like Intersango is wearing a halo and saying "See, officer, we stopped *that* bad guy, aren't we nice and oh-so-legal." while really everybody knows it's bullshit and there's nothing anyone can do to stop people trading on SR.
edit: I think OP should change the title of this thread (if possible). Calling something a scam just because it steps on your toes is an overreaction, and, in this case, has portrayed OP in a much worse light that he was trying for with intersango.