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I'd have to say that it's biggest help is it's accessibility. Sure there are better things, but they weren't as easy to read and the characters didn't seem to age with the readers (Though I'm still waiting to read something about Harry or Ron having wet dreams or Hermione getting her period, I mean, Judy Blum wrote about periods, and her stuff was for fourth graders. At least, I think it was Judy Blum who wrote that book about the girl getting her period.) Basically, it was just a little luck - or if I wanna be cheesy, magic. Also most books that so much as use the word "Magic" seem to be poorly written DnD trash, or at least, in my experience. There's always Eragon, I mean, sure it follows the Hero's journey so closely that it's practically the Bastard Child of LotR and Star Wars...
Oh well, any book that reaches the masses is good to me, the world needs more books that can become water cooler talk.
Also, Da Vinci Code: 'cause Jesus was a pimp, that's why. He was all: "yo Marry, I'm like, God's son and shit, lets have sex." and she was all "Damn Jesus, you're so fine." and then he was like "Hey baby, you know what they say, 'Go forth and multiply." and the rest was history.