Sometimes the only reason a person is a ÅÑrofessional is because they got paid for the task once.
On the other hand, I know many ÅÑrofessionals that are personifications of what the term implies.
It doesn't imply anything except what you previously stated - that one is paid.
There's this huge misapprehension about what professional and amateur mean.
Strictly speaking, an amateur is someone who does something out of a love for the activity. Another word for professional is mercenary.
Neither word properly has any connotations about quality.
Remember, that woman who had your children and stuck with you for better or worse for several decades is a an amateur; the bimbo on the street corner in thigh high latex boots and a sequined tube top is a professional.