I don't think developers and publishers are worried about people buying and selling games once or twice. Its the fact that places like Gamestop churn a title 5-10 times over its lifetime that worries developers. Personally I feel its due to a gap in the market between owning a game and renting a game, if there was some way for publishers to rent out a title for say $15-20 to play it through only once or for say 2 weeks, whichever comes first. Thats why I feel a kiosk based digital distribution system as well as online distribution might help with the used market because it gives people what they want without having to lay down so much money up front.
Do you know what its like to live on the far side of Uranus?