Most ticket revenue goes back to the movie studio. For the theater to pay its employees (and it's not even a living wage - ask them sometime about health benefits or retirement plans) and make a profit to stay in business, the money must come from somewhere.

Do you honestly think the $1.10 you pay for a large soda at McDonald's cost $1.10 in ingredients? The price of food at zoos, museums, theme parks and sports stadiums is far above what you would expect to pay in a grocery store. They have to pay for their building, variable costs associated with it - such as electricity, water, maintenence - and their payroll.