I think the answer lies in the amount and type of speculation done by oil producing firms and hedge funds controlled or in partnership with oil producers. These guys are not influencing the price to make a profit speculating, they are speculating to drive the price up with the knowledge that any speculative losses they take on futures will be more than offset by production profits on higher current prices.
Just look at this years oil and gas stats, they make no sense compared to supply and demand. We have historically high inventory levels that are still increasing, we have consistently reducing demand, and yet the price of crude is up 41% on the year and retail gas is up 61%? Also look at the increased volume in oil futures trading in the last 5yrs, much like the derivitives market it has increased exponentialy during the runup to our current economic disaster.
8yrs of deregulation in the name of free market capitalism turned banks, investment firms/hedge funds, oil companies, insurance companies, and others into corrupt profit machines that literally sucked the life out of the economy. Just look the P&L's of these companies over the last 5yrs and compare them to any growth metric that you want, GDP whatever and you will see exponential growth compared to little or no growth in the general economy