Because most people are not serious readers. The research I saw showed that half of all Americans had not read a single book in 2009. Half the population of the US had not read a book in an entire year.
The 6 inch e-readers are now cheap enough that a casual reader will think it is not a bad idea to own one. Most of the serious readers, lets use this board as and example, own a 6 inch reader and have no interest in a 10 inch reader.
The size of the screen makes them a great deal more expensive so they are not likely to come far enough down in price to interest many folks.
There is little that they can do about the weight of the 10 inch e-readers and people love the light weight e-readers.
There is little they can do about the size of the 10 inch e-reader. Many folks want an e-reader that fits in their purse or can be slide into a coat pocket.
All of this means that the 10 inch reader is going to be a niche product and that it is not going to receive much love. At least, not from Amazon or BN or Sony.
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