According to Newzoo, the worldwide gaming industry will reach $116 billion in 2017, up over 10% from the previous year. In addition, that number is set to grow at an 8.2% annual rate over the next few years, to over $143 billion by 2020. As you may expect, many gaming-related companies have ridden that wave to tremendous gains; however, one gaming stock has gone in the opposite direction: GameStop (NYSE: GME).