I think I've seen discussions about this before, and obviously the USSR produced art because we still see statues of Lenin today. But how does this translate in modern times with the instance of obscure art or other modern art? Often the purpose of that art is to explicitly go against societal norms for aesthetics.
In cases like "banana duct taped to wall", I think we're missing the forest for the trees. Art pieces like that are used as a tool for avoiding taxes for the bourgeoisie. So it isn't the sale of art, it's the sale of a capital-protecting-device, which has value so high because of how much capital one of said device is capable of protecting. Probably these art pieces' values would crash the moment that laws passed which closed the loopholes used for prior mentioned tax avoidance scheme.