The artist is producing a gift, making a change, causing good things to happen without hope for repayment. So, it’s possible to give less than you get from someone who is generous. For a while. But smart people don’t tolerate this for long, and the marketplace values these rare people too highly for this inequity to be a long-term solution for capitalists. If you are lucky enough to work with someone this generous, pay him a lot, or your competition will.