And I'm surprised that people seem to confuse FORUMS with IN-GAME ID.
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Simply because this applies ONLY to the forums. Not your In-Game Name/ID. The person whom you just wiped the floor with in SC2 won't know your name, Just as long as you don't post in the forums.
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Now, if they start implimenting this IN-GAME, so you know the real name of the person your going up against...then I could see a drop in sales. But until then, this entire F-up that blizzard has created won't change their profits one single bit.