This is an interesting article, which validly takes to task the mistaken belief that digital content is cost-free or cost-negligible to produce and distribute.
What the article does not adequately (or accurately) address is the differential in the per unit cost of of creation and distribution of electronic works versus physical works.
Also problematic is the article’s implication that the increasing proliferation of data impacts the cost of individual digital works. While increased volumes of data certainly impacts the total cost of storage, categorization, indexing, and distributing the entire body of data, it does not (in any manner which I have seen adequately demonstrated) increase the cost of storage, categorization, indexing, and distribution of individual works comprising the larger body. To the contrary, anecdotal evidence would imply that within certain nodal ranges, increased volumes of data would tend to decrease the per unit costs associate with each discrete work, spreading the costs over a wider number of works and enabling certain economies of scale. (I’d be interesting in seeing empirical data which would demonstrate whether this anecdotal evidence bears up in a wider examination of trends.)
Despite its apparent shortcomings, the article does raise the valid point that creation and distribution of digital works is not a cost-free proposition. Of course, the article does, by implication, beg the question, “What is the most rational basis for pricing digital works?” This appears to be a question with which the content industry is struggling mightily.