Hardcore gamers can be a very lucrative group for advertisers to target. Not only do they spend a lot of time playing online games, they’re typically willing to pay for products that bring joy and enhancement to their lives. In 2009, in-game advertising earned almost $700 million! If this trend continues, researchers expect this amount to reach $1 billion in 2013! However, advertisers can’t simply throw a bunch of obtrusive and boring ads onto their games and expect a windfall of cash to come pouring in. Instead, they have to delicately balance ads, unpaid apps and paid ones. And, they have to infuse in-game advertising delicately so that they don’t piss off gamers that can be tough! The good news is that 69 percent of gamers…