Business doesn't appear to be spectacular. The best selling paper, a $1,500 report on networking for next generation gaming consoles like the Xbox 360 from May this year, has an overall Amazon sales rank 240,430 in the books category.
At that price, nobody should be surprised that business is limited. Especially since I tend to visit Amazon to buy digital cameras and books. Still the online store claims that people who bought the gaming paper also purchased an Xbox bundle with Halo (mind you: this is the old Xbox and these discontinued bundles were overpriced ways for Microsoft to make Xbox fans pay for a T-shirt and hat).
This looks more like an experiment than a genuine part of Amazon e-commerce efforts. If people really would be buying IDC research papers on Amazon, you'd probably have seen office supplies or other business items pop up in the "customers how purchased this item also bought" section.
There is no information on the site indicating how long these sales have been going on. Amazon first started selling digital documents in 2001.
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