I didn't see Elfwreck imply that your retail experience was in physical items. I saw Elfwreck explain why the term "lost sale" traditionally means different things for physical items versus electronic items.
Although your reference to "the eBook community" coming up with a different definition would seem to indicate that your retail experience, whatever it might have been, was not in eBooks. Otherwise, that sentence is rather awkwardly phrased.
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