Satanus,
I would offer that it is not the 'speculators' themselves which needlessly drive up prices, but rather, their ability to operate in a system that absolves them of the consequences of their actions (not actually taking delivery on the items speculated on). Were this consequence enforced, most specuators would be strongly discouraged. But this seems tangential to the thread...
Terry,
I think that the thread's title is perhaps worded incorrectly? Anyone, anywhere, has the right to 'demand' anything. But you're really talking about the enforcement of such a demand. Does someone's need (percieved or real) merit justified action of others. If so, I guess the guy on the street is entitled to my wallet by force. After all, he probably has less money than I do...