What will exceed $1 billion in 2015? If you said mobile advertising revenue, you would be right. And of this cool $1 billion earned, mobile games will account for 17.4%, or $269 million. To put the number into perspective, that's about how much the 2011 award-winning "Batman: Arkham Asylum" earned at launch -- at $60 a pop. But unlike traditional video games, mobile games appeal to both men and women, young and old. Therefore, they pique interest from brands that normally wouldn't advertise in-game, let alone near them.