There’s nothing wrong with making money from your art. People weren’t making money from art in the past centuries because until a recent time in history there was no market for it or for almost anything else, and also no property rights.
The only market there was after the fall of the Roman Empire and until the end of feudalism, was church commissioning some art and construction.
Also, I don't understand the argument about artificial scarcity. Original art has inherent scarcity, and this is the foundation of the art market. And a digital album that can be copied by anyone with a tape recorder, CD drive or computer didn't prevent bands from making serious money, even in an environment of abundance.
Finally, markets are not that easy. There is a market for art as there is a market for SaaS, or services. And most SaaS companies fail, just like most consulting agencies and most artists that don't become commercially successful.
Artists choose to seek patronage in order to minimise risk, and we are lucky that contrary to the past, they can do so without giving up their rights to opportunity, as it used to be the case.