Do professional photographers call themselves "pros"? I thought they just called themselves "photographers". Only would-bes and camera companies perpetuate the use of PRO>Enthusiast>Amateur>Beginner>"I got a phone". You can be an expert and make no money, and you can make money and not be an expert.
"If you need to shoot, shoot. Don't talk"
My advisor in art school got started as a photographer for the US Navy in reporting the Korean conflict. He met W. Eugene Smith who pushed him to go study under Minor White after he got out. He did and he and Smith became good friends which was good since Smith would often drop in on his classes. One night closing a pub in Baltimore the class talking with Smith someone asked why do you use a Leica. His answer it is the best available and it never breaks nor seldom needs recalibrating. It is built like a tank, I could take it into the field and make sure to get the shots. He said it was a camera built for a professional to take the abuse that often comes from a professional photographer.
But Smith never once referred to himself as a professional photographer nor did my advisor Richard - although photography was all they ever did. Smith only took one shot of his kids but it was a special shot - which had a lot more to do with him than his kids. When Smith shot it was for him to express his passion and emotion. He spent time with his kids - not taking pictures of them.
http://time.com/37534/into-the-light-w-eugene-smiths-walk-to-paradise-garden/
www.pbase.com/tprevatt
Nikon and Canon make cameras that they call their professional cameras to take the beating of going to a war zone, going on long journeys to take images in far away places for National Geographic, to go on assignment to report tragedy. They cameras have to be designed like a tank and have to hold up. If someone wants to spend the money for such a camera - that more power to them. I am sure Canon nor Nikon will complain. However, most people know what a professional is and know one when they see it.
Unless there are laws against passing oneself off as a professional in a field - then people can call themselves whatever they want.
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Truman