To put this in perspective, that charge is almost the same as the charge for one of the programmers themselves. My guess is, Nosotek most likely have to pay for a third guy from the government to watch the browsing habits of the first two, and that third guy has to belong to both the set of political reliables and the set of internet-savvy people --- two sets which are already small in North Korea and whose intersection is even smaller. Not to mention the cost of the extra computer and internet connection itself
More links about Nosotek:
http://www.nkeconwatch.com/category/organizaitons/nosotek/