Bush went to get the oil, you're assuming that he was successful. In a way he was.
Iraqi oil production has increased massively, "Oil production in the country has been slowly but steadily climbing since the end of the war as the Iraqi government and partners such as Exxon Mobil (XOM, Fortune 500), BP (BP), Chevron (CVX, Fortune 500) and Total (TOT) work to repair existing fields and hunt for new sources."
"Iraq has lofty plans to one day produce 11 million barrels a day -- nearly equal to Russia's current output and a million barrels a day more than Saudi Arabia's production."
Iraq oil production surpasses Iran - Aug. 10, 2012
Doubling of Iraqi oil production by 2020?
"Doubling of Iraqi oil production by 2020?"
This is where the oil is. The war helped push prices up, and demand from China has seen oil prices rise significantly. To simply say oil prices are not what they were in 1999 without taking into account the effects of the real world is crazy. Venezuela under Chavez, who gained power in 1999, decided to push oil prices up using OPEC
Chavez Oil. Prices, CITGO, Exxon Mobil, OPEC, Hugo Chavez, Venezuela
"During his presidency, Hugo Chavez has giving special importance also to OPEC cartel. He has been promoting meetings between OPEC members to regulate oil production. This caused some controversies in 2000 when he decided to have some encounters with Saddam Hussein as Iraq is a member of OPEC. He also keep having meetings with other controversial leaders, like Iran's Mahmoud Ahmadinejad, Libya's Muammar al-Gaddafi and Algeria's Abdelaziz Bouteflika (all OPEC members)."
See the trend? Saddam gone, Iran sanctions, Gaddafi gone and Algeria is still there.
But Chavez tried to get OPEC to work together to push up prices, the US didn't like it, did they?
It doesn't matter that the US doesn't buy the oil. Oil prices go up and down depending on supply and demand. Reduce demand in countries like Iran, Iraq, Venezuela, Libya and so on, and oil prices rise, which means the amount the US pays for oil goes up, even if this isn't US oil.
Two of the companies extracting oil from Iraq are American owned or partly American owned, others have plenty of US shareholders, like BP.
The US stands to profit from increased oil production in the US on several fronts.
You have to ask yourself why US interests since the end of the Cold War have been Kuwait, Iraq, Iran, Libya, Venezuela, Afghanistan (oil pipelines), Kosovo (oil pipelines), and only a few other places.
Certainly Rwanda, Ivory Coast and Syria the US has kept away from, why do you think that is?