You would also have a low-quality video (hello video artifacts) and less-than-ideal audio. 720p is just not enough for a cinema's big screen (plus the 3k~ish bitrate is WAY too low for such a big screen), and the audio is not THX-certified or anything fancy like that, like most cinema movies are. This idea just isn't feasible.
And I don't think it would be popular enough for someone to warrant doing it anyway.
Additionally, depending on when you showed up at the theater, you may spend your money to watch 30 minutes of setup, a 10 minute run then 30 more minutes of setup.