They never ban by battlenet just by account, why would they want to stop you spending money on their games... i think not....
on US Servers From what I've read they only ban the License that's violating the ToS, but occasionally they will ban additional WoW accounts on that battlenet if they are linked somehow to the cause of it being banned I.E sending gold from a bot or something but this only happens on occasion
As far as other Licenses go such as starcraft, if you got banned on WoW it would never affect another game.. anybody who say's so is obviously trolling.