I've long considered that print book pricing is weird, although I've also understood the costs that print publishers incur and must recoup. Pricing of e-books is weirder and undergoing all kinds of change and justification. However, IMHO, the pricing of print and electronic versions bears no relationship to the value of the contents of the book itself. Now I expect to pay more for quality - think Ferrari versus VW Beetle when choosing a car. These items would never be priced the same, so why should all e-books be the same or similar low price. Hmm.
For more on this perplexing issue and the exponential rise in e-book sales, see Debbie Ohi's post: http://www.inkygirl.com/ipadgirl/2010/7/1/e-book-pricing-consumer-perception-vs-publisher-costs.html