They won't take up the sue everyone tactic, but they will go after the big offenders as it only makes sense. It not only hurts their bottom line, but the players that have to deal with the botters.

As per the licensing, the only thing you're buying is the media and the license to run the game by the software companies rules. Anything beyond what they specifically allow you to do with their software is technically against the EULA.

I understand not liking the idea of "renting" software, but as a programmer I have to protect my livelyhood somehow. There will always be hackers, there will always be those that find a way around things or to get things easier or to get them for free, and I'm not going to dispute that. It's when that method makes a somewhat significant impact on the companies profits or possible profits ( ie what happened with Napster ) is when you will see companies take action. While I'm sure profit margins are somewhat behind the reasoning for Blizzard to go after this, I think it also has to do with problems that these botters cause the existing customer base, and that's where Blizzards real money is at.