NPD reports that $1.85 billion has been spent in the first quarter of 2011 by consumers on game content. This content includes: downloadable content, game rentals, subscriptions, digital full-game downloads, social network games, and mobile games.
The NPD group goes on to state that consumers have spent over $5.9 billion on hardware and accessories in Q1 of 2011. These numbers are already at a 1.5% increase from the same period last year in 2010.
I can tell you this, these figures are extremely believable with the high costs of digital content. For example, a map pack off of Xbox Live can cost a single user $15 for a couple of maps, multiply that against all of the users on Xbox Live and you got a nice paycheck.