Is it? We can do a bit more math and see if it makes economic sense.
Pre-war oil supply from Iraq to the US was (April 2003) 22 million barrels for the month of April.
http://tonto.eia.doe.gov/dnav/pet/hist/mttimiz1m.htm
If you mulitply that figure with $20 a barrel, it costs the US $440 Million each month (approximate average) to purchase that oil from Iraq.
Now the war has cost us $500 Billion so far with no end in sight, correct?
If you divide the cost of war to date $500 Billion with one month's supply of oil from Iraq, you get 1136 months of oil supply OR roughly 95 years.
Instead we opted to throw away $500 Billion, create remorse towards the US from all around the planet, kill hundreds of thousands of people, while we could have struck a deal with Saddam and have him supply us with oil over the next century.
Does it still sound like a good business deal to you?
If you bought into it being solely about oil, no, you're right it doesn't make a ton of sense. To be totally honest with you, I don't think it was about oil itself. That's why I don't get into these debates much... because no reason makes a lick of sense to me. Not the conspiracy theories, not the government explanations... frankly, the whole thing feels to me like one of the horrible blow out fights my husband and I have once a year when my hormones peak on exactly the wrong day. Where you can't pinpoint what brought it on, can't find the right explanation, you're just pissed and want to punch someone and scream for days on end. It simply has to be taken out on someone.