Studio contracts: The movies are delivered digitally on encrypted hard disks and when playing there is a ton of telemetry sent back to the studios. They are watching the theaters like its 1984. Studios have contracts indicating the play will play X times no more and probably no less(else studios might hold back the good movies). AMC keeps it simple. Play the movie even if no one shows up. AMC in particular uses laser projectors now so who cares. They ain't burning out any projector bulb.