I think it's important for a manufacturer to make sure that the materials they use on expensive, prestigious products are not only beautiful, but durable as well, so that even if the product has been used for a long time it will still look good and people will be convinced of their products durability and longevity, thereby convincing people to buy from the same company again. I bought a Sony Xperia Sola smart phone recently and I was pleasantly surprised to see that a screen protector was already factory-installed by default, saving me money, effort and time buying a screen protector. Sony did well here: putting on a screen protector ensures that the glass is protected and the product stays in good shape longer than if Sony never pre-installed the screen protector. It's not just a good gesture from Sony; it also helps the phone stay pretty longer and convince people that Sony products are durable, even if it's just a screen protector (just take off the screen protector and the product looks new again - just put a new protector on to continue making it that way).