They do have sales listed. But this doesn't tell us operating costs vs. sales. A look at their P&L for the quarter shows they lost over $3 Won in the quarter (again, total company). Clearly they aren't doing something right and if they can make some money off the sale of a game they no longer wish to support seems within the realm of possibility. Here's hoping.
Consolidated Sales Breakdown by Game (Excluding Royalties)
NCsoft Corp. & Subsidiaries
(January 2012~ June 2012)
(Unit : KR Mn Won)
1Q, 2012 2Q, 2012 Total
Lineage 43,646 58,449 102,095
Lineage II 18,413 16,912 35,325
Aion 52,947 36,367 89,314
City of Heroes / City of Villains 2,890 2,855 5,745
Guild Wars 1,709 1,277 2,986
Others 6,334 13,822 20,156
Total 125,940 129,682 255,622