I understood 'hobbyist' to mean someone who does this activity AND participates in forums with reviews and critiques. Like it is their responsibility to inform others of their experiences and to 'give back' to their communities. I have seen internet posters describe it as this too. So when someone refers to themselves as a 'hobbyist' I have an idea of demands and expectations and what they plan on doing after. So the "not a main occupation" kind of discredits that definition as a hobby, as I've noticed the follow-up seems to be a rather intensive undertaking, and time consuming.
Whereas just a regular person who sees companions, is just that. A regular person with no vested interest in reporting experiences but only enjoying them.
That to me, now, is what a 'hobbyist' is.