what do businesses do on trips that cost so much money?
In my case, when I am in the heart of a multimillion dollar project, there is always some sort of equipment/tools/etc that wasn't considered. And when you are all the way around the world in Guam... you just have to buy the stuff and expense it.
Then the hotel is 150 bucks a day. Internet $10 a day (at the Hilton business center). Buisiness dinners can be at the upwards of $400 depending on how many customers are eating with me.
Car rental is $135 a day. Telephone calls, etc etc etc.
It gets up there really fast.