Instead of "pro-brewing" I have been calling it "commercial brewing" to avoid people getting their feeling hurt/dander up, whatever. I know some homebrewers who know more about brewing than some pro - ahhh, I mean commercial
And I have found the homebrew community rich with creative ideas. Some of the best beer you will ever taste without question is homebrewed.
OTOH I would para-phrase Steven King who says a "professional writer is one who writes something, gets paid for it and pays the utility bill with it." I think the same thing applies here. Also, I will point out that most commercial
brewers (myself included) brew several times a week (I brew 3 - 4 times a week now) and we eat, breath and sleep brewing all day, every day and often well on into the night. I don't have many times during the day when I am not thinking about something regarding the brewery, often I fall asleep wondering if my yeast shipment will arrive or wake up worrying if the glycol pump is still functioning. So there is a "pro" aspect to it that goes beyond just an "art form". And, FWIW I am a trained artist and I consider brewing a "craft" not an art form but boulder is right - enough of semantics already.