It's just - no ones does it. Hence: Zero value.
Just because you don't know about it does not mean it is not happening. (Sorry for all the negatives, that is just how the thought goes) The nature of bitcoin is such that you simply cannot see what it is being used for, and unless somebody comes forward with examples you will never know how much money is being transferred around the world using bitcoins. If you look closely through the forum you will see examples of people moving large sums of money around the world, like I said, Just because you don't know about it does not mean it is not happening.
I had offered in the past to sell homebrewed mead for bitcoins, and at some point I want to build myself a still to make harder stuff (although I have been told my mead is pretty stiff). Let me know if you are interested.