I think you're assuming that art requires a market for buying and selling. Most people mostly make art because it's fun and personally fulfilling, not so much for rich folks to enjoy.
Not sure what you're getting at. Just pointing out that most art isn't for monetary profit, it's just people enjoying the process at home and with friends.
Just trying to dispel the idea that art is a "job". It can be a positive part of people's lives whether they live on basic income, were born wealthy, or work some job for money.