Absolutely never heard that. For me, being professional only ever meant that you are qualified to do something because you conform to the professionalism rules in a given community. e.g. a music band can be super professional by how they behave and not make a single paid gig.
> A professional is a member of a profession or any person who earns their living from a specified professional activity. The term also describes the standards of education and training that prepare members of the profession with the particular knowledge and skills necessary to perform their specific role within that profession.
We could skip the "earn their living" part, but then we would all end up being professionals. :)
