It's called murphy's law, get a screen protector since it is a lot cheaper than getting the display replaced.
^This... seriously... some people are just stupid... they spend $200+(+) on a phone and then cheap out on a $5 screen protector... really?? besides some of the protectors (SGP Crystal) make the screen look better (clearer, more contrast) than bare class. I work with horses in a sand-filled arena and will tell you sand WILL destroy ANY type of glass, including these people's precious 'Gorilla' Glass... it's nothing more than a marketing scheme...
I have never used a screen protector that I liked the feel of, thats why I dont use them...