That's an odd way to characterize it, IMO. Like if someone wanted to argue that Zemeckis makes substandard movies because he wants to profit from it, I should be able to argue that the Leanardo DaVinci painted substandard art because he profited from it. 100 years from now, nobody will care if Zemeckis made money, because he'll be dead. The legacy is what remains. The art is what is left behind, and what is left behind is better preserved if more people like it. I would argue that the value of art is not a pure measure of quality, but more like the product of quality and outreach.