Seems reasonable enough for an airport or something similar where you would spend lots of time unable to leave.
As for the cinema, the amount of time you would spend there doesn't seem long enough to warrant it. However, I have no idea of how harsh the rule about bringing in outside food is - would you not be able to bring a fruit with you into an american cinema? There's no equivalent rule in my country, there's candy stores right next to the cinema that probably get half their customers because of it.