I don't really print much, but when I do, it's amazing that I can take something digital and put it on a piece of paper.
The reason that's awesome is that I can then hang it on my fridge. Or take it with me in my pocket, without having to worry about electricity. Or, you know, one of the other thousand use cases where a printed page is more usable, reliable, or feasible than something turing-equivalent.
Paper and printing should die and will die. One day. But that day is not today because none of the alternatives are ready. Recently I had to work on a project that had a 500-page spec. All my screen space was taken up by code, application and command windows (and I had a very large amount of screen space). I tried keeping the specs open on a separate screen. I tried loading it to a Kindle. Nothing was fast or convenient enough. In the end, printing and binding the spec and keeping it on my desk solved the problem (I know!). The time savings for me and my team was probably worth a hundred times more than what the printing cost.
Also, beautiful concept. It takes a great mind to even think of something like this.