Maria Popova digs up a nonfiction gem from Henry Miller, To Paint Is to Love Again, in which he addresses the question:
Certainly the surest way to kill an artist is to supply him with everything he needs. Materially he needs but little. What he never gets enough of is appreciation, encouragement, understanding. I have seen painters give away their most cherished work on the impulse of the moment, sometimes in return for a good meal, sometimes for a bit of love, sometimes for no reason at all — simply because it pleased them to do so. And I have seen these same men refuse to sell a cherished painting no matter what the sum offered. I believe that a true artist always prefers to give his work away rather than sell it. A good artist must also have a streak of insanity in him, if by insanity is meant an exaggerated inability to adapt. The individual who can adapt to this mad world of to-day is either a nobody or a sage. In the one case he is immune to art and in the other he is beyond it.
The Dish 