Thanks for the info all. I know nothing is ever 'simple, but if S Korea stopped investing, and China remains all pissy, then Kim Jong has nothing left, correct? I imagine we still send food over, but no money ourselves.
And if any Americans want to go themselves (I have to confess that I would very much want to), check here, they have allowed US visitors during Arirang season: http://www.northkorea1on1.com/