The question is not whether it is easy, the question is whether it is profitable. Evidence suggests that it is not, as Amazon scarcely seems to care about updating the Kindle DX.
It's exactly because it would be good at reading PDFs and technical papers that it is not economical. The idea behind the Kindle is that Amazon will sell the Kindle for a relatively cheap price, and Amazon will make money selling the books. If you (the consumer) are reading your own documents or documents you do not buy from Amazon on the device, Amazon is not going to be making money from that.
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