I'm buying a 13" Macbook Pro for college and was wondering if the Moshi guards are necessary. I'll be the only one using it and I won't be traveling with it often. How long does it take for the keyboard to wear? Is staining the aluminum palm rest an issue? Are people just exaggerating? I want to be cautious and get them but I want to make sure it worth it. It seems kind of overkill to me.