I really have no idea about their costs and don't care or remember when I see it. I always assume it is for their entier "net", that is all forums (I think they have the rpg ones and the wc3 ones as seperate) plus all their different sites for each game and their main loaded inc. Their also has the blizzardnews.net site which among other things seems to have "their store" which seels various products despite claiming to not be a comercial site, I call it a comercial site if you have a store selling products, but that seems to be an opinion not shared by themselves :) To be honest thought, they don't sell it themselves but through chipbits.com and appearantly linking to amazone too (no idea if they get a commission fro mthere).
There are three types of people in the world. Those who can count and those who can't.