this is all a load of tosh
The industry encompasses people who shoot the off portrait of a baby, through to photographers that that go to the Artic for months on end and shoot pictures of wildlife under the ice. lets not forget the commercial, landscape, medical, forensic, architectural, still life, product, glamour photographers too. On top of that we have out and out artists. If we start talking about standards, where do we begin to draw a line?
Professional simply means "behaves in a professional manner" and "earns money from"