Also, being an author is pretty much a sales job and sales jobs have always been variable. For example in my city right now, the hot boutique store sells designer cupcakes. These people are making a fortune. If you had told me five years ago that a cupcake store would be raking it in, I'd have laughed at you. But it's like any other sales thing, you make your money on units sold, and if people want to buy cupcakes, or books, or widgets or whatever, then great. If not, and your sales fall, you diversify. If knowing that you will work X hours and get Y money is important to you, you get a day job that *isn't* a sales thing, and then you moonlight for the passion work.
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