“Know thy audience,” could be the first rule (and only one that matters) in any class on the business of publishing. It usually means, “Understand who will be reading your book,” meaning the person who likes to read your kind of book. If it’s a hard science-fiction book, think of all your hard sci-fi-reading friends, create an ideal amalgamation of them all (with or without beards), and now make sure your book reads like those that person usually enjoys. This is great advice, if a little obvious, meant for a writer who has a publisher to take care of the business details. It’s about writing a book, not selling it. For those who self-publish, the maxim has to mean something else: “Understand how your ideal reader shops.”
All smart publishers ask themselves this question periodically, and it seems to be top-of-mind for DC Comics these days as they relaunch their entire line. The internet is abuzz with analysis (some say DC is alienating its core fan base, others think they are hurting brick-and-mortar stores with their digital strategy, others think it’s brilliant, others think Superman’s t-shirt makes him look silly.). None of it (as far as I’ve seen) comes from the perspective of that fundamental question, but the move and the reaction to it has become a great illustration of how important it is to ask, especially for self-publishers, who must ask it of themselves every day.