I think the only way Patreon can work for an artist is if he or she were to offer up something with continuity, like a comic series or animation series, to keep supporters interested. I'm not sure how it would work for fine art/illustrative artists, but a series of paintings on a subject people like might work. But it seems to me that you'd have to keep producing new product on a regular basis and offer free gifts and stuff to make it worthwhile for your patrons. Which is not a bad system, to my way of thinking.