Google Glass is likely to be released for the mass market for only $300. If that is the price, I will definitely buy one.
Where I think Google Glass will be useful is taking pictures, for example while you are on holidays. There is something so vain and fake about taking out a camera or smartphone to take a picture. When you take out the phone or camera, you announce to the world that you believe this moment is a special moment and everyone starts to pose or act in a way to live up to that moment, and every photo you see on Facebook has that cliche and artificiality to it.
When I travel, I don't want to have to take out a camera or a phone. I want Google Glass to have some app that will take automatic photos or at least allow me to take photos quickly and discreetly.
I am not a big traveller. I think travel is something I will do later in my life when I am more financially secure. But I cannot wait for it!