Do you remember when you believed in Santa Claus and Christmas was so simple? Then you learned the truth, and everything became complicated?
The same thing is happening in the oil markets. You must educate yourself about the commodities market, but let me give you a quick example.
Suppose you are president of Air BigRob. Suddenly you see something that makes you believe the price of aviation gas will go up in the future. To protect yourself against a future price rise, you go to the commodity exchange and buy 100,000 barrels of aviation gas to be delivered in two months. Fortunately for you, the price of oil is the same on the future's market as it is today. In other words, nobody else is worried about a future price hike in oil.
In two months, war has broken out in Mexico, Brazil, in the Middle East, and a hurricane is threatening to blow through the Gulf of Mexico. The price of oil has tripled. At the same time all the airlines are paying higher prices for aviation gas, and airplane ticket prices have doubled.
Because you were clever, and bought oil in the past, you are taking delivery of aviation gas at low prices. You are rich.
Now suppose you are somebody who has no need for oil, but is simply a trader. That means you are a gambler. You buy and sell oil because you have inside information that Obama is going to send in troops to Libya soon.
So, you buy 10,000 barrels of oil to be delivered in two months at a low price.
As expected, Obama expands the war with Libya and oil goes up in price. You don't want all that oil, so after 1 1/2 months you sell that oil contract to someone who needs it soon. You will make a big profit on your oil because we are now at war.
Now envision thousands of traders who all think war is going to break out in two months. And they all rush in to buy oil at a low price. But after the first few hundred traders buys oil, the price of oil delivered in the future starts to go up. The next week, more traders buy oil and the prices rise even faster.
Finally, the local gas station is seeing prices rise and he raises the price of gasoline. And the Oil Companies are in hog heaven because they can sell their oil at higher prices!
But look. This all happened because of speculation. Oil is still being pumped in at its regular schedule, storage tanks are moderately full, NOTHING HAS CHANGED! But the price has doubled!
That is why the future's market and the traders have such an impact on prices. A lot more going on than "consume it, or store it."
In your own example, you openly admit that demand has risen (ie traders want more) while supplies remain constant (oil is pumped at its regular schedule)...basic economics tells you that when demand increases and supply remains constant, prices rise.
No matter how you want to explain it, at its core, you can do two things with oil....store it, or consume it. Even if a trader buys 1000 barrels for delivery two months from now, and then sells that to someone who needs it, the options remain the same....store it, or consume it.
If the trader is unable to sell his contract, then it is a clear indicator that the demand is not present, and the price is inflated...if he is able to sell his contract, then there is a demand for oil at that price.