And their iBooks Author software is dead on arrival by definition: Its license locks the authors exclusively into the iBooks store, even if Apple decides to NOT publish the work, the authors will not be allowed to publish it anywhere else. Those terms are completely unacceptable, especially since the iBooks Store is not nearly as attractive as Amazon's Kindle Store and only reaches a fraction of the audience. That software is a desperate and unethical attempt at catching authors that don't read the fine print.
This is wrong. The only thing that becomes exclusive to Apple's iBooks store is any iBook that you write in the iBooks Author application and then post for sale in the iBooks store. If you publish another version of the same book by other means via another service, you do not owe Apple anything. The Pearson and McGraw Hill textbooks that went on sale this week, for example, will continue to be published by others means, and Apple will not receive a dime from those sales.