It is estimated that the wars have so far cost the US about $3trillion.
http://www.timesonline.co.uk/tol/comment/colum nists/guest_contributors/article3419840.ece
It is costing the UK about �3billion a year.
With very little to show for it. As geezer points out, it has created a refugee problem, We are more a threat from terrorism rather than less. The wars are recruiting grounds for Al Qaeda. And instead of stabalising the middle east and oil supplies, they have made the region vastly more dangerous. Not forgetting the 300 british lives slaughtered and many thousands of American ones.
It is hard to imagine a worse outcome. As you say, a little financial bribing could have got the job done for a fraction of the price. But that way, Rumsfeld's friends at Halliburton would not have obscene profits.