Yeah, I really don't care about a developer/publishers concerns with used games... it's like most other products, you sell it to customer 1, and from that point on, you don't get anything more for that copy of the item... deal with it and build it into your price structure on the initial sale if you have to.
But... I hate the used game model at places like EB Games...
Game A brand new is on the shelf for $65... I go in to trade in a copy of that game and they give me, if I'm lucky, $15 or $25 in-store credit... and then turn around and put that copy of the game on their shelf with a price tag of $54.99. Of course they want to push those used games over the new ones, they make a killing on it.
My biggest surprise is that people (customers) actually go along with that business model.