There are quite a few folks with either an Xbox 360 or PlayStation 3 copy of Call of Duty: Black Ops. Just over 23 million, in fact, as of numbers tallied following the first nine months of sales by its publisher. Activision revealed as much during an analyst call this afternoon, showing continued sales growth for the Call of Duty franchise versus install base numbers for the two HD consoles combined.

If that weren't enough, it looks like a huge chunk of those who purchased BlOps were interested in adding to their multiplayer map variety. Activision's numbers show the latest CoD entry as having moved over 18 million map packs since launch (which, priced at $15 a pop, works out to 270 million dollars in gross earnings), 7 million more than MW2 and 9 million more than WaW.

Though the company isn't projecting any map sales yet for the next installment in the CoD franchise, Activision Publishing CEO Eric Hirshberg said on the call, "There's plenty of runway this year, with 20 percent-plus expected growth in the HD console install base alone," referring to the company's expected sales of Modern Warfare 3 this holiday and beyond.