Although I've never published a book myself, I have friends who have -- some through self-publishing outfits and some through the traditional means.
Since it's their business and not mine, I've never asked what they made on royalties or what they were paid in advance. But you want to bet that if I did, none of them would say that they cleared almost four-fifths of a million dollars on a book that sold about three thousand copies?
Which goes to show that I should become friends with New York governor Andrew Cuomo, who declared that figure as income on his tax returns. Because everyone who likes to write should have a friend who can clear $245 a copy in author royalties on a book Amazon's listing for $13. Or at least should have that friend's agent.