Consider this:
You leave your home. You wish to leave your computer at home. You don't have a computer safe. What do you do?
Put the computer in this book, and put it on the shelf. Done and done.
All kidding aside, I was recently robbed and had 3 MacBooks stolen. I should have had a safe. But barring that, it would have been awesome to have hidden them on the bookshelf rather than sitting on my desk where they were even visible from outside.