I'd argue that if i buy a physical book, it's mine I can sell it. If what I'm buying is a license then that is mine and again I can resell it, when you consider the ridiculous DRM that so many content providers are trying to push I don't see how they can even argue it with a straight face. They have the ability to de-authorize a copy if the license is transferred.
You'll probably argue that I might have broken the DRM and still have a copy? Well if i rip a Cd and then sell it to a used cd place I've done basically the same thing. That's a violation of copyright, that would open me up to a lawsuit, one I'd probably lose, fair enough but it doesn't change MY property rights over the things I've legally obtained be they book cd license or toaster I can throw it on ebay or in the trash give to my long lost evil twin.