Remember that you can look at a lot of data on the US like this and come up with seemingly shocking figures, simply because of the huge population of the USA and their higher than average disposable income. I bet if you looked at other things like total amount spent on other optional/nonessential items - chewing gum or fabric softener, for example - you'd end up with a dollar value in excess of what many governments spend :-)
Oh, I know. Our GDP does it. If US can spend $80 Billion on lottery tickets imagine what we can spend to win a war. Makes you think more than twice before poking the bear.