All of the many complaints about the 30% that Apple take for selling through their store are indignation based on ignorance of retail practices, this includes Pete Townsend. The publisher love that Apple only charge 30% because its far less than a normal retail channel. The publishers get more per sale electronically than they would selling physical books.
To answer your second point did you watch the announcement or are you just letting your predjudice define your opinions. One of the most interesting parts of the announcement was that these books would be updated, for free, meaning that you would always have the latest version. I'm still getting updates to app purchases I made on my iPhone 3 years ago. There is no reason why this wouldn't be the case for textbooks.
On your final point, rather than getting all high and mighty about it, just think about it. Why do you sell back your expensive textbooks? Partly because they are expensive. If they are cheap enough that you don't have to sell them back wouldn't it make sense to keep the book? I guess it depends on your view of education and knowledge. I view it as a life skill, something that you add to from year to year.
In general your post, and its rating, are why I've stopped look at Slashdot as a place to influence my opinion. It is filled with small minded opinion based on the status quo. I thought as geeks we were supposed to embrace change and look to the future. As with a lot in the world it seems that this happens less and less as the years go by.