The value of working a retail job at some point in your life as an artist is valuable. The insight into commerce, the feeling of working in service to others—even if only as a raw exchange of goods and services for money, and a camaraderie with people in the same position alongside you are all vital to reaching a deeper understanding of humans in contemporary society. If your art isn’t touching other people in some way, if it’s too . . . deep? It won’t have the power to find and keep an audience or fanbase.
I’ve watched dozens of people I knew over the years find some measure of success with their work, and I’ve come to know a smidgen of it myself. What I’ve noticed about my day jobs, in interacting with customers and clients, is that the amount of care I take with all of them—in craft, in concern that the thing they’re buying is what they want, in appreciation of patronage of all kinds—reflects in a lot of ways in my work.
I’m not sure you can not give a shit at your job and turn contempt around in your art. Probably some geniuses can, but very few of us indeed are those.