And then the thought shifted to dominance. Of course, it's unlikely to be useful for a hermit, but the usefulness for a civilized person in society is hard to overestimate. Many of the things that invisibility allows you to do can be done officially. You can also build a psychic amplifier and take control of people's minds. Or order the president of your country to attack another. You can prevent nuclear missiles from being launched. I recommend this option.
Added 19 minutes later
Well, and again, let's say you wake up on a Tuesday and are going to school to your beloved 7th grade B for a math test. Will teleportation help you much here? Or time travel? Will you conquer worlds? Unless you can sleep longer, because you don't need to spend time on the road. Yes, that's valuable, of course. I don't like traveling. How much of life is wasted on all sorts of trips? Something like a little less than a quarter?
But that's all. Just sit and write the test.