Too many people would rather disbelieve then to believe in anyone including their own self. Watch what others question are. The types of questions being asked are where they are mentally. Just because you don't believe something doesn't make it false. Open your mind to world of self belief.
The same notion goes with being a professional artist. People don't think they can make a living when they haven't even don't a speck of research and believe only what they are (told). Artists are the only people who have failed. There are by far more business owners who have failed then artists. What it all comes down to is the mindset of learning instead of seeing failure as a final forever result.
If the artist is providing value for your business by displaying in your business, what doesn't matter if he or she does this professionally or not. The main point is the artist is bringing high value to your business and in a timely manner meanwhile being professional. I am here to help those in their weaknesses and have other people in where my weaknesses are.