My rational is that I personally think the DS will get to around 33 million copies sold in America; then I thought that this game won't have the attachment rate of the first two generations of pokemon games (but would have a greater attachment rate than the third generation on the GBA) because the fad effect from the 90s has worn off a bit--though not on people like me;). But I thought because this game would be on the DS and Nintendo seems to be more in the public light lately, they might be able to get around a 18% attachment rate, or about 1/5 DS owners in America would have Pokemon Diamond/Pearl. This 18% of 33 million would give 5.94 million copies sold, which I rounded up to a nice 6 million.
Since as you stated before the attachment rate for pokemon games for the GB was around 20-25% and for the GBA around 14%. So I used historical data, but tried to add in the possibility that this game will have a higher attachment rate for the DS than for the GBA but less so for the GB to give me the attachment rate of 18%.
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Since as you stated before the attachment rate for pokemon games for the GB was around 20-25% and for the GBA around 14%. So I used historical data, but tried to add in the possibility that this game will have a higher attachment rate for the DS than for the GBA but less so for the GB to give me the attachment rate of 18%.