Jane Austen wrote novels even though at that point in time I do not think they were generally accepted as a good pastime, yet her books have become classics. You might not be able to make a complete living off of writing books, but that hardly means you shouldn't write. If Walt Disney had given up on cartoons just because of repeated failure and no one willing to hire him, then... there would have been no Disney. (Can you imagine life without Disney?)
And people still do read books for fun and educational purposes. Myself included, even though right now it has mainly been school related reading. xD
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