Above: PC/MMO statsImage Credit: Ad2Games/NewzooThe massively multiplayer online PC gaming market is expected to grow from $24.4 billion in 2014 to $30.7 billion in 2017, according to a market research report by analyst firm Newzoo and performance marketing firm Ad2Games. By 2017, the PC/MMO game market will account for 31 percent of global game market revenues, the report said.