What I like about forums is that everyone can express their own opinions and agree to disagree or debate an issue all while respecting others viewpoints. One viewpoint is not correct and another is wrong-- they all hold valid ideas and concepts to the holder, which is why we have freedom of speech.
Now, as to my own thoughts...
My daughter always tells her clients that she is a youth performer. She doesn't state amateur nor does she state professional. She does give them access to her website where they can review the awards she has won and read the testimonials of past clients and let them make their own judgments. They don't have to hire her, nor pay her fee. It is their freedom of choice.
With that said, what my daughter will do is always strive 100% to give a PROFESSIONAL performance. She takes her study into the art of magic seriously. She will not take a job that she (or we) do not think she can deliver on. She has turned down jobs that were not her strong point, because why tarnish the reputation you are trying to build? So far her strategy has worked for her.
Now just to let you know she is not trying to become a restaurant magician at age 14 (15 on Saturday!). Her love of magic extends to family entertainment such as public venues where she does stage shows or private events where she does parties. Although her magic does seem to cross the ages from young to the older generation. She has performed for very young children, and for retirement community-- and everything in between.
I guess in conclusion my opinions is that whatever category you fall into be it amateur or professional-- you must always deliver a PROFESSIONAL performance so it reflects well on the magic community.