It's no different than a printing of a book. The book sells once from the retailer, the company profits, and that's the end of it. It's "off the official market" now and can only be resold in used bookstores by private retailers without the company getting another cent from that particular printing. That seems perfectly fair to me and a lot of other people. If the company wants to cash in on the same content again for another sale to the same person, they'll just have to reprint the book. Studios can just re-release the DVD with an incentive for the customer to buy again. They are never going to have claim to used sales profits, because that's double-dipping. They no longer own that tangible item. The person who bought it owns it and deserves 100% of whatever it resells for, regardless of who owns the copyrighted material inside that media.