a) you already saw the movie -- what's to say you aren't a cheapskate, BSting them to avoid paying?

b) you already occupied a space on the cinema that somebody else could have used

c) they already paid for the reel to the movie distributor

d) it's a work of art, and subjective. Who said you only get to pay for the movies you like? If you don't like Citizen Kane you should get your money back?