The photographic amateur may be better-educated, better-equipped and better-practiced than the professional. He may know things about lenses, filters, lighting and gamma correction that an Ansel Adams would never have considered. The difference is that, when faced with a difficult or seemingly impossible shoot, the amateur will explain why it can't be done (or at least why it can't be done satisfactorily) and walk away, while the pro will explain why the customer's vision may need to be reigned in a bit, but will find a way to get it done the best way possible if the customer insists. It's not just "anything for a buck", but having a professional attitude toward customer service.