Sure war costs much but it's gives much too. Orders for military tech, jobs to fulfill this orders etc. I don't think that Obama have a lot of concerns about few Americans lives compared to the profit of war.
Hmm.... private contractors and defense manufacturers can make money.... And there is enough petroleum to be stolen from countries such as Iraq. So overall... there might be a profit.
Not profitable? If Ukraine joins the EU there is a free market of 50.000.000 potentialt customers for european and american producst. Ukraine is not producing much they will buy everything from EU and USA from food to machines and weapons what means they will be slaves!