It sounds good but price ceilings rarely help people. The free market generally does a good enough job at finding the optimal price. It's easy enough to say that movie theater owners are greedy and just want more money, but that's exactly why they're even in the business--to make money. If you remove that incentive, they really have to reason to continue operating.

You can see this in action in New York with its rent controls: the government decided the common man needed to be able to afford housing. Seems like a noble goal, but soon landlords couldn't afford to fix their houses or pay for utilities, and so they left the market. And nobody was going to start a new apartment and nobody was going to fund one because it's unprofitable. As a result, the housing situation is even worse than how it was before.