It is hard to think of another writer as great as Mark Twain who did so many things that even merely good writers are not supposed to do. Great writers are not meant to write bad books, much less publish them. Twain not only published a lot of bad books, he doesn’t appear to have noticed the difference between his good ones and his bad ones. Great writers are not meant to care more about money than art. Twain cared so much about money that what little he writes about his art in his autobiography is almost entirely, and obsessively, about the business end of things: his paychecks, his promotional tours, his financial disputes with publishers, his venture capital investments in publishing and printing technology.