Nik Fletcher:
>The item you’re selling has to be priced relative to any physical predecessor. No, really: when you’re supplying a digital copy in place of a book with substantial printing costs, we’re going to question why we need to pay a premium when there’s lower costs associated with the production of said item. The idea that a user should pay a premium for the ‘convenience’ or ‘privilege’ of a digital copy is laughable, and will simply disenchant users who feel penalised by this premium.

This is one of those posts that I was nodding along in agreement with the entire time I read it.