That's the same deal in Venezuela too. What sucks is it used to be almost the same here. Up until 2006, it wasn't legal to sell West Texas Intermediate Crude (WTIC) on international energy commodities exchange markets. WTIC had to be sold on domestic markets where prices were monitored for speculative swings and controls were in place to limit them. That all changed in 2006 when our wonderful Congress snuck some wording into an energy bill that repealed that limitation and WTIC could be sold on international markets.
What was the result? If you look at London's ICE exchange, they averaged about 70,000 oil trades a month before the law was changed. By March 2007 after the law had actually gone into effect they were up to 200,000 a month and they had the first 1,000,000 trade month in their history in July 2007, which you may remember was when oil prices spiked here in the US. This trend would have continued were it not for the housing collapse. Also keep in mind there were no increases in demand from China, or India, or the US that drove this trading. This was all done 100% by speculators who rushed into the energy markets once they saw the other markets falling and they needed a safe haven for their funds.
This is why the concept of supply and demand between oil users and producers went out the window a long, long, time ago. The prices are determined by the supply of oil futures and demand from speculators and investors, and has nothing to do with how much gas is actually used.