If your talking about making into a movie, It's so people could see it how stephanie saw it. Her view became your view. Lesen the book Du could imagine many things for Bella but in the movie Du see the only face for Bella, Edward, Emmett, etc. Also because the Bücher were a hit then why wouldn't the Filme be a hit? People would make a lot of money and those playing the main characters would be known world wide. If your talking about the book it's a simple answer. See Stephanie had a dream which made her sit down and right it. She got engrossed with it and ended up making a whole saga. I mean it can happen. Plus Schreiben is a passion to her. Maybe she just wanted to make a new era a Vampire to.