It's funny how many people try to justify Apple, probably against their own self-interest of having a potential for cheaper books. Of course Apple has leverage, tons and tons of it. Access to their IOS devices for publishers. Yes, I know you can install a number of competitor apps, but there is only one Apple app for that, iBooks, and iTunes to tie the whole thing together.
They have a huge advantage over their competition.
Anyway, as a consumer, this is what I would like to see. I would like to be able to buy ebooks at the best price available (same way I am used to buy a physical book). I should be able to read that book in whatever device I choose, and in whatever app compatible with the ebook format, better yet, allow for change of format, i.e. epub to pdf, html, etc. Ideally without DRM. However, even with DRM this could still be possible if the publishers are able to permit downloads to a customer in whichever format they choose. I know I am kind of dreaming, but just think about all the freedoms you lose when you go digital book, opposed to a physical book. Just think you buy an entire collection of book from Apple and in a few years Sony or someone else comes with a great device, all that investment in books, gone. It is as if you buy a new house and the bookcase is not compatible with your books and you have to get rid of all your books and start anew. I don't even want to get started about the restrictions to borrow books from friends, etc.