People, exercising their own spending discretion, don't want to pay to see his crummy movie.
Moore is, of course, one of our more ostentatious hypocrites. Here's a picture of this "anti-capitalist" waving from the window of his black Cadillac Escalade.
No, wait...Sorry, my mistake. That's not an Escalade; that's Mikey's suit jacket. Still, that much expensive fabric definitely represents capitalist excess.