I have no problem with your having your opinion about things, but the facts are that the copyright law specifically reserves the right to resell or otherwise transfer copyrighted materials for the copyright owners. I listed the basic copyright law rights that are reserved for the copyright holder in a previous post, and this was one of them.
In the USA, there are exceptions carved out of this overall rights reservation, but you have to understand, those are specific exceptions with specific conditions attached to them. The copyright law does not have to "prohibit you from treating your digital media in the same way you treat non-digital media". The overall copyright law prohibits you from ANY resale, transfer, rental, etc. of copyrighted material. Then, the First Sale doctrine comes along and says that the physical object you purchased may be resold -- a book, a CD, a painting. But that's all. Digital media is not included in that exception. And that exception does not cover anything but transfer of the physical object, for example, making a copy of a physical object's contents (e.g. reprinting the painting, ripping the CD, making a photocopy of the book) is not an exception. (That said, ripping CDs for personal use has actually been declared legal by some recent cases, which is why a product like iTunes allows you to do it.)
BTW Fair Use is another exception that's widely misunderstood, but that's a whole 'nother discussion.
That said, there is an active court case scheduled to go to trial next month (I referred to it in an earlier post) to see if resale of digital media passes a court test, if done under controlled conditions by a third party. That decision will be interesting. But for now, it's the way I said it is.