I don't think there is a single art form where you can expect to make a decent living, even working yourself to the bone and/or 'treating it as a business'. The

I don't think there is a single art form where you can expect to make a decent living, even working yourself to the bone and/or 'treating it as a business'. The successes we see are all outliers. Any medium where this turns out to be not the case (such as changes in technology or fashion) quickly gets swamped and supply again exceeds demand. The most reliable way of being a successful artist is to become financially stable some other way (get a job), allowing you to redefine what success means to you.