It's all about atoms and rearranging them to create more value!  If you rearrange the atoms of coal, you get diamonds ... (Don't we want to let them do the diamond thing to us?  Nanotech can raise our value in every imaginable way, is the key concept.)  Learn more about Ralph Merkle here.

Nanotech is only the bottom layer of the mountain that science intends to control.  See the layers shown below.  Read Alison McDowell's post here.