Assuming they grouped sales of the K3 and DX, I think it makes perfect sense to group the two B&N products. A lot of those NC sales are unquestionably e-reader sales: consumers considering various reading devices and settling on the NC, with or without consideration of the tablet features. Many more are both tablet and e-reader sales: consumers not previously in either market for whom the tablet features made an e-reader purchase worthwhile (or vice versa), and consumers in the tablet market with e-reading as a significant consideration.
The existence of a third (almost certainly smaller) division of consumers purchasing the device with no intention of reading on it does muddy the waters a bit, but it would be considerably less sensible to compare the Kindle and Nook brands while omitting the NC.
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