Wow that seems extreme, but I can unfortunately understand Blizzard's position, it is true hacking does damage the games value. It causes players (or in Blizzard's view, potential future customers) away from a product with which the sucker... err, customer would have otherwise been enjoying.
Compare it to a movie, if all my friends say the movie sucks, I'm very unlikely to go spend money and see it myself. If all my friends say a game sucks because of hackers, I'm very unlikely to go out and buy it.