In an investor meeting in Los Angeles, Activision CEO, Eric Hirshberg, revealed that the average spend for Call of Duty: Black Ops with post-release map packs, was USD$76. 18 million of these map packs have been sold since the game's release.

You don't have to be good at maths to see how astounding that is.

According to Hirshberg, there was an 18 percent increase on DLC sales over previous titles. Modern Warfare 2, for example, sold 11 million map packs while World at War sold just 9 million.

"There are over 30 million unique players of Black Ops who collectively have amassed, incredibly, more than 2.3 billion hours of play," he said.

"To put that number in perspective, that's more than a quarter of a million years of play and that means our millions of fans spend more time per day on Black Ops multiplayer than they do on Facebook."

Call of Duty: Modern Warfare 3 rocks the boat this November, but will it maintain this significant trend with Battlefield 3 vying for top-spot? Only time will tell.