Those aren't large numbers, percentage wise. Considering China has about 4⅓ times the population the U.S. does, the 20 million presales represents only 1 out of 70 people in China (vs 1 out of 16 in the U.S.). The disparity of any country's income would allow for such a small upper class.
As of 2012, China's "upper middle-class households, with incomes of $16,000 to $34,000, represent only 14 percent", of households.*
Even excluding upper-class & middle-class households, only 1 in 10 upper middle-class would need to buy an iPhone to reach this number.
*That 14% upper middle-class is going to grow to 54% in 8 years.
http://thediplomat.com/2013/05/half-a-billion-chinas-middle-class-consumers/
number isn't large?
oh. did anyone mention to you that China isnt a capitalistic country?