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Just as the largest cost of the beverage and snack food products is convincing people to buy the product, most entertainment is largely promotion not content.

Children will buy anything their friends want...from pet rocks to pop music, the desire to fit in has the best marketing edge for the young.

Since human brains don't mature until the mid-20's (and their minds may never mature,) selling to the young is usually not much of challenge in any society where they make purchasing decisions.