Question about troop levels

I was wondering why there are as many troops in Iraq as there are. We toppled Afghanistan's government, but we only need 11,000 troops there. Don't we have as much to do there as we do in Iraq? (I.E., rebuilding government, seeking out and destroying remnants of the old government, and looking for someone who doesn't want to be found... though now Hussein is caught, there's one less thing to do in Iraq.) According to the CIA World Fact Book, Afghanistan is 647,500 sq km and has a population of 28,717,213. Iraq is 437,072 sq km and has a population of 24,683,313. Afghanistan has more area and is more heavily populated... I would think that the largest need for troops would be in the larger country. Does the hunt for WMD (that probably aren't there) require 20 times as many troops, or is it securing the oil fields? My guess is there's more money for US corpoartions to make in Iraq, but I was wondering if I'm just being too cynical, and there really is a stragegic reason for it.

We and our stooges only control Kabul and the pipeline route. That's all they were after. It was also a legal war. They had a "legitimate" election. The Afghanis wanted to run the King, but Bush wanted his stooge in. Not my definition of democracy.

Iraq is not legal. The oil wells are everywhere. To control the oil wells, one must be friends with the new government (never happen in a real democracy) or own the legitimate government without anyone knowing. They plan is to sell the oil to Bush's friends, so they need a real legit government. Anything not put in by us will be anti-US. For good reason too. Can you imagine next year with the price of gas at $10 a gallon which way the election will go?