I'm keeping my Crossfires, too. I just bought a 2005 Limited coupe to replace my 12 year old Chevy Lumina sedan. It was basically worthless as a trade-in so I donated it to a place that fixes up old cars and gives them to a battered women's shelter. I could have kept driving it if I had wanted to. There was nothing mechanically wrong with it and it only has 81,000 miles on the clock. However, it wasn't a Crossfire.
I ride the bus to work and average about 4,000 miles a year driving. Splitting that mileage between two Crossfires, I expect them to last a very long time. So, I don't really care about depreciation.