To the folks who read Nexon's financial reports: is this game in jeopardy?

You have to remember that Nexon NA is not their primary business operation, Nexon KR is. Nexon Korea made over a hundred billion yen in revenue in the 9 months ended September 2015. Japan, China, North America, and Other (Europe is in here, it's not a big enough segment to report separately) added up to less than 30b yen of revenue. To answer your question not particularly because NA made a loss from underestimating marketing expenses, their revenue went up from DomiNations. Marketing expenses related to a new release will likely go down over time at a rate faster than the decline in revenues related to DomiNations. MapleStory isn't the only thing Nexon makes money from, the game is fine financially. They don't report MapleStory revenue separately but if there's a related significant event that would be mentioned and no such thing was.