Examine why Superstars Get Paid so Much and the Effects on the Industry Involved

The film industry today is priceless in terms of movie production costs and salaries. The production of 'Superman's Return' has just finished beating the world record for the most expensive movie ever to be made, with a production cost of $250 million. But why do film companies like Columbia Pictures invest so much money in one movie and pay enormous salaries to film stars? What effect does this have on the film industry? Is it just because Johnny Depp is making an appearance?
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