Why are there commercials at the movies?
I can recall just a few short years ago when there weren't any. None!
Now you get hit with a ton of ads before the Previews even begin. Why? It's not as though those commercials off-set the cost of the film. Movies are now over $10 for one ticket. And it's not as though they off-set the cost of the snacks. For the price of a large popcorn at the movies, your money could buy two large garbage bags full of popcorn anywhere else.
You get free shows on the major networks because commercials pay for those TV programs. You pay less than you otherwise would for some cable channels because commercials help to off-set the price. But at the movies, they off-set nothing!