If books costs $ 10,000 each, everyone understands that you would actually earn * less * than you do at the current price - range. (jlake.com)
Also physical books cost more to produce and are generally priced higher. (goodereader.com)
I understand that digital books cost money to produce, believe that intellectual property should be valued independently, and know that creators deserve to be paid for their creative content. (dearauthor.com)