[plorkyeran]

I don't think it's really meaningful to look at it like that. The tournament isn't funded specifically by sales of the items which contribute to the prize pool; it's just a general marketing expense to increase the number of players. Even if everyone decided to boycott compendiums for some reason, the whole thing could be a net profit if they spent the same amount of money in the dota store on other things (actually, it'd be more profitable...).