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I may be short on my prediction. GW2 announced that they had sold 2M boxes so far, with another 10 days until MOP. I had predicted that MOP would sell double, in it´s first day (and only in the west), than GW2 sold in the month leading up to MOP. While most of GW2 occurred the first week, you gotta figure they are still pulling in 100k per week... so give them 2.3M boxes when MOP launches.
I don´t think MOP gets 4.6M sales, even 4.2 will be pushing it.
One telling thing though is how many people are riding around on the collector´s edition Mounts. Not only does that indicate that a ton of people have already bought MOP, but that they paid $60 for it. Those mounts are so common now that I wouldn´t even use it if I had it.
2M for GW2 is a huge number... but in reality, MOP will sell almost double that in 1 day to people who will also have to pay $15 per month, and that is only in the West.
I like Blizzard´s business model much better.