According to a report by SuperData, social casino games are expected to hit $1.6 billion in worldwide revenue this year with the number of players doubling since 2010. Furthermore, the online games research firm expects the market to grow wildly on Facebook and increase to $2.4 billion by 2015.

“Both small social game developers and large land-based casino operators are looking at this new space,” said Janelle Benjamin, SuperData’s vice president of research, “With declining margins in the overall social games segment, casino-style games offer a healthy growth potential.”

SuperData estimates that the average social casino gamer spent $78 in July or nearly double the amount the average social gamer spent ($43). Those numbers refer to the average revenue per paying user, since most users in free-to-play games pay nothing at all.

The U.S. is the largest market for social casino games with $660 million in annual spending from 35.4 million monthly users, followed by Europe ($446 million) and Asia ($311 million). Latin America spends $180.7 million on social games, while Australia spends $59.8 million.