So if a publisher chooses to sell his at a higher price, what's the problem? A certain number of books are priced higher because the creator/publisher believes they're worth more than the 99 cent books. If a well-known artist wants to charge more for his painting than the unknown street artist, shouldn't the well-known artist be able to set his price? Or does some third party come in and say, "No, EVERYTHING must go for the same price." So you get a Picasso for the same price as Joe-the-Plumber's painting of his dog.
Frankly, I'm amazed that everyone here thinks it's OK to tell a writer/publisher that, no, he can't set his own price. That some other entity -- Amazon -- has the right to tell you what you can sell your book for.
Ironically, those authors who publish their own books through Amazon CAN set their own prices. You can set it thirty bucks one day and change it to fifty cents the next, depending on which price you think sells best. Why can't a traditionally published book be treated the same way as the self-published author? Why does Amazon get to decide what to charge for JUST the traditionally published books?