I dont follow League either, but I remember ppl were hyping the LCS Season 3 World Finals (similar to TI3 as Leagues biggest annual tourney)
being held in Staples Center and selling out in minutes. But the Grand Finals was wack and ended up a 3-0 stomp by some korean team.
As for their prizepool it wasn't crowd funded ( 2,050,000 total) and was $1 Mill for 1st place.
I don't think Blizzard will ever match that prizepool since starcraft 2 is much difference since its a single player game,
although they are set to release a new MOBA " HoTS" but most people are thinking its more for casual than competitive play.
heres a cool site where it shows player earnings and tourneys