Screens being scratched is an odd one, they are generally all fairly resistant with a few anomalies such as the Galaxy Nexus (which gets scratched easily by all accounts).
Unless you are especially careless I don't think screen protectors are ever worth it.
The galaxy nexus does not have gorilla glass, it has an Oleophobic coating, which is to resist finger prints and general grease/oily looking marks, not scratches.
Whilst I do agree with you on that last part in some ways....... I think if you get a good screen protector like the martin fields one (expensive though.......) it really isn't an issue and it is worth it, as said you would hate it if you got an inch long scratch in the centre of your lovely X screen now wouldn't you?
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You people do know that copper, steel, nickel, iron, gold, silver and aluminium CANNOT scratch "Gorilla" glass because it is lower on the mineral hardness scale. Simple science. Plus, it's marketed as scratch resistant, not scratch proof.
All these videos showing knives, coins and keys trying to scratch toughened glass are just worthless.
Something in your pocket or person has come in contact with your screen which is higher on the scale. It's usually sand, because that's literally in more places than you'd think.
This!