Don’s right on the money here and it plays nicely into the theme I was getting at with my last link too. Read this and think about these things after Christmas:
For example, it’s great to have new discovery tools, but for better or worse, actual book sales (both print and digital) still rely on identifiers and other metadata to facilitate an actual transaction. Subscriptions and rentals require the ability not only to ingest and display titles and the accompanying metadata, but also to serve content in multiple formats, to interface with accounting and royalty systems and to provide a data mining tools for publishers, among other things.
Direct-to-consumer businesses, both on the sales side and on the self-publishing side require skills not typically found in book publishing businesses, including customer acquisition, understanding the lifetime value of customers/users, customer service and the ability to deal with many small transactions rather than a relative handful of larger orders from more traditional wholesale and retail customers.