As far as no protector OP, I'm waiting for your next thread where you complain about scratches on your screen!
I laugh my butt off for those that put anti-glare protectors on their phones! It degrades the screen, so what's the point of having retina? Only one Apple sells in their stores degrades the screen they go crazy about.
not sure if serious. People use those for the same reason they might use a privacy screen protector. It serves a purpose. Some people don't want fingerprints...at all.