Over $6 million has been raised for the prize pool of Valve's DotA 2 International tournament, making nit the largest tournament in gaming history! Last year, the DotA 2 International saw a huge $2.8 million prize pool, but the 2014 tournament has dwarfed it.
Where is all of this money coming from? Crowdfunding, that's where. Anyone who buys a DotA 2 Compendium from Valve contributes $2.50 to the growing prize pool, which has a heap of stretch goals attached to it. Most of them have been unlocked because it has ballooned out to $6 million now.