I don't know about boring. It's simple, and deliberately undramatic, but it is ultimately a summation of the book's central premise. 'It's what I do' means 'this is who I am', 'this is how I experience life, how I see the world, how I communicate'. 'It's What I Do'.

That said, you're right, it's probably not punchy enough to sell a movie. As I've said from the beginning, I expect the studio to ask for a change...