I think HP is probably doing the same thing my father explained about the automakers when I was ten years old. He said that if they can get away with removing one screw or rivet, it'll add up to millions of dollars when they add up all the cars they sell. So, I imagine some beancounter at HP says hey, we can save fifty cents by not including a CD, if we sell two million boxes, we just made a million bucks.
This make perfect sense.