From iTulip.com:

See also paper gold vs. physical gold.
This seems to a symptom of the monetization, securitization, and trade in everything. The artificial financial market is overpowering the natural market forces for the physical entity.
It’s as if there were a desert island with one coconut that somehow was supporting a hundred firms trading coconut shares, coconut futures, and coconut derivatives. That sort of trade can’t go on forever.