League of Legends, Dota 2 will lead PC gaming’s fastest-growing sector to $500M this year in North America

Those huge, PC free-to-play mulitplayer online arena battlers are about to make more money than the long-dominant massively multiplayer online games for the first time ever.

League of Legends and Dota 2 are among the most played games in the world, and last year they generated (along with other MOBAs, or multiplayer online battle arena games that feature teams of players going up against each other) $406 million in revenue in North America, according to research firm EEDAR. The analysts at EEDAR expect revenue from these games to grow by 23 percent in 2015 to $501 million.