Are you suggesting that we can trade-in/upgrade a license to kill or the holy grail, or even the continuum transfunctioner?
You're just as much of a jerk as avaloncourt, why do you have to put down someone for asking a question?
Because it's an extremely dumb question if you think about it outside of the "well I have a phone and now there's a better one so I deserve it free" bubble. I can't think of a single item off the top of my head where you get some sort of discount for owning an older model. Yes, you can trade in cars or go to a place like Game Stop for video games, but that's not getting credit for owning an older model. Apple and AT&T aren't in the used cell phone biz.
This question has also been asked a million times in the past couple of months. The only way people stop asking extremely stupid stuff (If I own a Mac, does that mean I get a discount? Can I still use the 3G iPhone if I don't live in a 3G coverage area? HOW MUCH WILL IT COST? WHEN IS IT COMING OUT?) is if some of us open up the flame-throwers.