Nathaniel Kahn’s documentary poses the question “What is the relationship of art to money?” to a handful of prominent figures in the contemporary art world, including richer-than-god Koons, Sotheby’s chairman Amy Cappellazzo, self-styled populist critic Jerry Saltz, and the painter Larry Poons. Their answers, while often brazen, land ambivalently, creating an incomplete portrait of an art world that seems completely resigned to the status quo.