For me I first read the title. If it attracks me than I pull the book out from the shelf and turn to the back. I read a bit of what the story is about and if I am interested I take the final stage which is reading the first two sentences. If the first two sentences do not grab me then back it goes on the shelf. This all takes place in a matter of seconds. I might be putting down a great masterpiece but I take all of this into considersation when I write. Is the title attractive? Is that one paragraph describing the story intriging? Are those first words a grabber? Just wondering what grabs you?