Pretty much the opposite, in fact if there's a continuum it's between canonical professions of:
"accountant" -> all qualified practitioners have a steady income, little variation between accountants and
"rockstar" -> huge variation - winner takes all, a few practitioners get most of the fame and income, the majority get nothing.
No prizes for working out where "artist" and "celebrity" fit on that continuum.
The drivers is, how much does the business model scale?
Accountancy is still pretty much 1-to-1; but everyone on spotify/iTunes can in theory listen to the same hit band (within same musical tastes) so the 2nd-ranked band gets far less play than the 1st, despite being nearly as good. Scale down to the 100th who is also quite good but has to have a day job. If you know musicians you have met them.
Yes, portraiture was in Rembrandt's day a business model that did not scale, but van Gough was later - he wasn't a portraitist and photography was established by then.