If you pay attention to the business news you will notice the price of oil today if for November or December delivery. The news rarely mentions that fact in their reports. Everything in the pipeline today is at the high prices of July, August, Sept. Its like the gas you bought for your car at $4.25/gal. Until you use it up you cannot take advantage of the current low prices to fill up at $3.25. By the time your tank is empty, the price might be on the rise again. While the price of crude it dropping, other things are holding. UPS is not cutting rates for instance.
The reason prices rise faster they fall is because of cash flow. If the price of raw materials double and you sell your products for less that what it will cost you to produce, your are bankrupt. You cannot afford to buy more raw materials at the current prices. That's why gas goes up so quickly. While it may seem like they are making more profit, it all goes to buying new raw materials. If the price of gas is not raised, the station does not have any cash to buy new inventory.