I remember saying once that the only stupid question is the one not asked... within reason, of course.
By definition, a professional is one who gets paid for his/her services, skills and/or knowledge, so the moment we receive even one peso for anything related to recording, we are already a professional, mediocrity notwithstanding. Should we prefer not to receive a single cent, then by definition, that person is an amateur or a hobbyist, but it does not reflect the skill level of the person.
Sure, there are many who consider themselves to be professionals in this endeavour, but the number decreases when you start to factor in that skill level. One thing I do know... one's mediocrity in recording is directly proportional to what one DOESN'T hear. Too many starting out in this business are so concerned with what they see onscreen, or how far the VU meter's needle or bar jumps or how heavy the waveform is when drawn.