You keep using the word "useful" in a way that suggests you've narrowly defined it in your head to exclude art. Life without art quickly results in a whole lot of death. Even the poorest humans throughout history have created music and art, because it's a fundamental part of human life. Just because art is less critical to immediate survival in most cases than eating doesn't make it any less necessary than it; shelter being more or less critical than food in a given situation (deadly sub-zero blizzard, more critical. Temperate area with no dangerous weather or predators, less critical) also doesn't make it more or less necessary, it's just a varying order of necessity. Being anti-Capitalist is important, but I feel like you've written off "professional" art as the domain of Capitalism rather than another victim of it (which food is as well, for that matter).