I wondered the same. North Korea is a potential gold mine. Sooner or later, the regime will collapse or open up to capitalism, and when that happens the influx of foreign capital will be enormous. When the labor costs in China become "too high", and when Vietnam is no longer "that cheap", going to NK will be the natural option. Location-wise, NK is right next to Japan, so it's less of a logistic nightmare than, say, Cambodia or Laos.

In fact, I remember reading an article in the mid-1990s about an investment fund that only invested in extremely risky places, like war-torn countries in Africa, or hermit states like Belarus or NK. The idea is that when things have hit the bottom, the only possibility is for things to get better, and though the risk is very high, if 1 out of 20 countries they invested in turns out to become a stable, investor-friendly state, then the foreign investors will flock there, prices will rise, and the fund's initial investments will yield astronomical returns.