How does a professional athlete sign a contract and earn a certain amount of money but have a lower net worth than the amount they earned?

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I was looking over the net worth of a specific baseball player and it says his net worth is between $6 million-$15 million. But in the same article it says he earned $51 million playing four seasons in the majors. If he earned $51 million how is his net worth $15 million max?

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