According to market data firm SuperData, they recently released numbers to The Know in which it was revealed that in 2014 alone, Valve managed to pull in about $1.5 billion in revenue from Steam. SuperData revealed that about $400 million alone was brought in by Valve’s own games such as DotA 2, Team Fortress 2, and Counter-Strike Global Offensive.
Also given that Steam, just like most app stores, takes a 30% cut from sales of other games by other developers, it has been estimated that these royalties are around the $330 million mark. It’s interesting that despite the fact that games like DotA 2 are free, they still manage to pull in quite a bit of money, largely thanks to its in-game purchases for vanity items.
Of course at the moment the king of MOBAs is still Riot Games’ League of Legends, which last we heard raked in a very cool $1 billion in 2014 alone, which is two-thirds of what Valve made on Steam overall.