Someone who paints or creates any artistic work solely to please a Buyer. This term need not be gender specific.
He painted only meaningless Abstracts as such things found ready Buyers. He had become an art whore.
Noun- Someone who specializes in feeling special for maintaining the delusion that art is inherently valuable. This is typically done by selling their artwork, which requires a massively inflated ego and fosters a dependence on the insulated world of art critics. This dependency can be likened to the relationship between a hooker and a pimp.
"John Doe is an art whore. Before that he, like all other artists, was a wanna-be art whore."