Never understand people who buy beautifully designed iPads with state of the art displays and then stick screen protectors over them. Just be more careful. I'm on my fifth iPad and have never scratched any of them.
Everyone is different. Some see the benefits of screen protectors and others don't. And some want to protect their investment as much as possible, even from the scratches that you can't see that you don't think are there. I see the benefits of screen protectors, but I choose not to use them based off how I treat my devices and I'm not accident prone.