Is it unethical to movie hop and/or bring your own snacks to the show?

I stumbled on this website that will help movie goers schedule an entire day of movies for the price of a single ticket. If one were to bring their own drinks and use a saved popcorn bag with a refill left most of the time the teens working behind the counter don’t mark the bag, it is a pretty reasonably priced day of entertainment. But is it stealing? Is it justifiable in light of the skyrocketing price of movie tickets, $5.00 sodas and $6.00 candy?