That's what's great about reading these books. What if there IS another little world that we don't know about out there? What if they ARE hiding in society? Highly unlikely, but I'm a dreamer.
It's not the fact that a vampire is going to come waltzing up and proclaim his love and undying thirst for you, it's what the girls reading the books see. They see a girl who NEEDS a man. A man no matter what. The first thing...she sees the golden-retriever guy and decides she won't date him (who does that FIRST thing anyway?!) Next, she sees Edward and loves him. He falls away and she is pining. She can't continue until another man rescues her, when she could have rescued herself with time.