Well, I do hate to burst your bubble, but studios have been misreporting grosses for years, AND, most importantly, have been caught doing it. Do the research and you'll find out how true this is. There have been several big stories in Variety about this and the films that were caught doing so. WHY they would do it is a mystery but do it they do, usually by several million dollars.
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Never fear. My "bubble" is thick as elephant hide.
I'm wondering: Over-reporting to avoid being classified a bomb? To grab a weekend highest-gross-ever title? Projecting what they "hope" it will make?
From what I've read, it's usually the projection, rather than a deliberate intent to mislead.
However, to grab a record or to avoid the appearance of being a dud, I can also see overprojection happening....but I don't think this is "the rule."
I am aware of the thinking behind wanting to believe this documentary's grosses have been inflated. Anything is possible. It is possible it might have been done to encourage people to see the film, but I think the greater truth is that the film made what they said it made, if not more, and that too many people were unable to see it this past weekend due to limited screens.
The press and on-air Radio/TV discussion about this movie have made it an instant success.
Quite literally, it's the hottest ticket since "The Passion of the Christ," but as a documentary, it won't draw the crowds that film did. For one thing, the right wing will avoid it. The knee-jerk reactions to it, alone, make most folks want to see it.