Well you have to take in to account that at least 3.5 million WoW players are in the Chinese market according to Blizzard. Over there the Burning Crusade expansion has yet to be released which means right now there actually only 5 million available buyers.
With 3.5 million copies already sold this means an amazing 70% of available buyers have already purchased BC within two months of it's release.
Assuming 70% of the Chinese market also picks up the expansion (0.7 x 3.5 million) you can add 2.45M on top of the current 3.5M sold for a total estimate of 5.95 million sold not taking in account any future growth.
Of course it is always possible China rejects BC but that seems unlikely to me. How much farther this can go is anybody's guess, WoW is truly a global phenomenon.
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With 3.5 million copies already sold this means an amazing 70% of available buyers have already purchased BC within two months of it's release.
Assuming 70% of the Chinese market also picks up the expansion (0.7 x 3.5 million) you can add 2.45M on top of the current 3.5M sold for a total estimate of 5.95 million sold not taking in account any future growth.
Of course it is always possible China rejects BC but that seems unlikely to me. How much farther this can go is anybody's guess, WoW is truly a global phenomenon.