Now that Midnight Sun is officially published on SM's homepage, I wonder why she doesn't finish is as a present for her readers.
You can¨t publish the same book twice, because it is the same story from another perspective. Learning about Edward's thoughts clarifies the whole story and give a deeper understanding of his motives and the things he says and does later on in the other books.
Please Stephenie - this is not about more money. You already wrote the first 12 chapters. Give your loyal readers a treat and publish the rest on your homepage.