I think what's bothering a lot of people is that even though there are no physical production costs and the first sale doctrine doesn't apply (e.g. you can't resell it on eBay, Amazon Marketplace et al), the prices remain very close to the hard copies which give you those extra rights and a tangible item. It comes across as a bit of a ripoff.
Still, it's similar with music I suppose. If it's the same price as the iTunes album then it's better to own the CD, so that you have something tangible to enjoy and eventually resell if you want to (deleting any iTunes rip of it in the process of course). Yet the iTunes store does great still, so I'm sure iBooks will. I guess we're pretty much paying for convenience and more people are willing to do that than those who aren't.
These are strong points of course.
While it's true that there are no physical production costs, there are still some costs associated with physical delivery. Surely they are less than the energy cost of transporting and storing thousands of books, but they still do exist.
And I can fully understand the desire to maintain the first sale doctrine. It's not an issue to me, but I know that there are people who consider it very important, both from a practical and an ideological standpoint.
My confusion just stems from the fact that in my experience, buying the sorts of books I read in the Canadian market, it seems that the ebook version will be significantly cheaper to make up for its shortcomings. This seems to be the case to me except in the cases of heavily discounted works, which rarely interest me. An even better looking situation is the two year old, rather obscure book. If I drive to every book store in the city I might find one hardcover copy at full price. Or I might find a copy in the ibook store at 5 bucks.
Ultimately, in my opinion an ebook is a different sort of product than a physical book. It comes with its own set of advantages and disadvantages. I think that if you're buying an ebook, you're buying it because you want an ebook. It doesn't necessarily need to be considered a 'lesser form of book lacking in tangibility.'
Of course it's highly unlikely that I'd be buying an ebook anyway. But that has nothing to do with pricing.
Edit: For example, if I were to decide that I really enjoyed reading books with the ipad, I could easily see myself paying the same or higher price for digital versions of the pulpy fantasy/sci-fi stuff I like to read. My ability to save my precious shelf space for classics, rare volumes, stuff for school, favourite childhood books, and things like that would be worth a premium to me. As it is, my small apartment is overflowing with books and that situation is unlikely to change any time soon.
As a side note, has the entire world forgotten that up until a few short years ago Apple sold a personal computer called the ibook? I can't be the only one who thinks of a shiny white room filled with shiny white computers when I say that word....