Since the work to bury his records had to have started as far back as 2007, to calculate the real cost of fighting exposure one would need to include the money spent on detectives, lawyers, operatives, literally around the world. And add to that, the graft sent to places like Indonesia to get their support in hiding his records from anyone looking.
Unless, of course, there is no there there, and Obama has hidden nothing. Like it or not, that is a possibility that must be considered.