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I think it has always been that way. Arthur Conan Doyle wrote his Sherlock Holmes stories while working as an eye doctor, and Issac Asimov had a doctorate in chemistry, Michael Crichton was a surgeon I believe & John Grisham was a lawyer long before he was an author. Some just wanted to do something different in their off hours I think and some needed another source of income. I don't imagine any of them ever expected to be such a success as they were.
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