My nine-yo son and I went to see Iron Man when it came out. Every time I'd glance over at him, it was obvious that he was enthralled with it...even the during those scenes with Tony and Pepper and all the talk. Heck, if he's anything like I was at that age, he's had a few visions of Gwyneth Paltrow in that party dress to keep him occupied, for those rare occasions when he isn't imagining himself fighting and blowing things up as Iron Man.

You should be able to sell them yourself, as long as the buyer would be able to run them. However, I would question the morality of selling someone a game that you knew was not working...