[/INDENT]Both companies have confirmed you will be able to sell and buy pre owned games. To be fair what they haven't qualified is if there will be charges or activation codes needed. The rumours go from "Full msrp" to "free but it will enforce a deactivation of the previous owners copy".
Agreed, and Sony with the PS Vita are already making games tied to an account but I never heard much backlash against that. If I lend a PS Vita game to a mate it wipes the game data that I had saved, there is no cost involved but it's following the same sort of lines as the home consoles might be taking.