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That's a damn good question, and I don't have the answer. I think it's something to do with hoity-toity "literary" concepts. Or maybe it's so self-impressed writers can go to cocktail parties, nibble on cucumber sandwhiches and say, "why yes, Muffy, I am a novelist." Beats me why they put it on there. Maybe I can go to one of my parties, do a kegstand, and inbetween chants of "drink, motherfucker, drink!" spount out "oh hell yeah, I'm a novelist, man, and that means I'm damn important!"
That's the long way of saying "I don't know."