According to Activision's Q2 2010 earnings call, the Modern Warfare 2 Stimulus Package on PS3 and the Resurgence map pack on Xbox 360 were sold more than five million times combined between April and June.
These figures mean that the map packs rank in the top five retail titles for the US and Europe in 2010. "For the first half of the year, Call of Duty map packs have generated enough revenue to rank among the top five retail releases in the US and Europe thus far in 2010," stated Thomas Tippl, the COO of Activision.
He also went on to add that if map pack sales for the first half of the year were taken into account, that they would have generated more revenue than the top selling game of the year.
Source: Seeking Alpha