Are the costs of the Iraq/Afghanistan wars worth it?

Year by year we hear about the costs of the wars overseas, especially in Iraq and Afghanistan. The question that is on everyones' mind is, is it worth the billions of dollars in tax payers money to try and keep peace in a foreign country? The estimated total cost since the start of the war in 2003 is $750 billion. Several factors have contributed to these costs. For example, the helicopters, the tanks, the warships, the trucks, the fuel to run them, the troops salaries, the cost of rebuilding Iraq, etc. Economists are working tirelessly to come up with theoretical figures for the final cost of the war. Some estimates put the total cost over $2 trillion. A more conservative estimate puts it at a little more than $1 trillion. These costs have greatly effected our economy and our every day lives. Most Americans are asking themselves if it's all worth it.

http://www.nytimes.com/2007/01/17/business/17leonhardt.html