A recent insight that came to me is that when paying money to access any content encrusted with DRM, you should never think of the transaction as a sale, but merely as a rental. You have not purchased anything you can own, merely gotten the temporary (long or short term) use of it, and under limited circumstances (use on particular devices, or in particular programs).
Consider the reasonableness of what you are paying according that formula. For my part, I might be willing to pay 2 or 3 dollars to rent a book that I might otherwise purchase for 10 dollars in hard copy, but I have no interest in paying that same price or more to rent a book that I could pay to own it (whether that ownership be in hardcopy, or unencumbered electronic file that I may use when, where and how I see fit).
The FSF "Defective by Design" campaign has promoted the idea of reading DRM as "Digital Restrictions Management", but I propose you could also call it "Digital Rental Management". Once consumers begin to understand the nature of transactions involving DRM (that they are not making a purchase in traditional sense, and that having paid their money, they own nothing as a result) then I think they will be begin to demand pricing in line with what is actually being offered to them.