Well according to the Blizzard COO it isn't. Ever since Blizzard announced that Starcraft 3 was going to be a trilogy, the gaming community cried foul and said they are just milking their franchise. Some even went on and blamed the recent merger between Activision and Blizzard saying that the evil people at Activision are behind the decision.
In an interview with videogamer.com Paul Sams, the COO of the company, came out and said that "The fact of the matter is, it's absolutely, positively untrue about us trying to stretch it out and milk it. People think that it was a monetary driven decision. I can absolutely, positively tell you, with 100 per cent certainty, that that was not part of the conversation. I guarantee it. I give my word. There was never, ever a conversation where we said, 'let's do this because we're going to make more money'. I guarantee it. As a matter of fact the sole reason we did it was because we thought it was going to be a better experience. Anybody that says otherwise is not correct. It is absolutely not what we did it for."
Even so, it's hard to deny that Activison and Blizzard wallet's are going to benefit tremendously from this decision. He even went on and said that it was a "quality driven decision". Even though he has come out and defended this decision on behalf of his company, it is doubtful the gaming community will take this to heart.
News source: VideoGamer.com