My first girlfriend in high school introduced me to the Harry Potter series. I would frequently discuss the things I liked most about the magical world, but when I asked her what kept her reading, she said it was the potential romance between Ron and Hermione. Similarly, when I read the Hunger Games, I struggled to understand how the Peeta Vs Gail argument seemed to get attention over the brutal nature of the story. When you look at the books traditionally sold in department stores, and the largest sections at the library, there is a running theme; romance. It consumes such a large portion of the literary market, that it's a risk to write a book without it. Fifty shades of grey is the wrong book at the right time. Harry Potter created a massive generation of readers, most of which are women. Now that they're getting older, they're searching for new books to read. Add on top of this a generation of men raised by feminists who are neither domineering nor particularly romantic, and you've got a recipe for romance starved masses. So far, I haven't been able to figure out the logic of book choices though. Harry Potter and the Hunger Games seem to have their romantic elements emphasized by the readers more so than their respectable authors, where as Twilight and Fifty Shades of Grey are all romance, but the writing is atrocious. It's like a Hollywood director turning out an Oscar worthy movie one year and a direct-to-dvd stinker the next. You can't predict which will come next or why it's happening that way. Other than the romantic elements, I haven't figured out a pattern yet. But, I am certain that this trend of specific books catapulted to the mass market will continue for many years to come.