Should I trade?

As a data point my 2010 d was a loaner car. Premium/winter/nav packages. Paid $39k with ODO at 8.5k miles.

Dealer is betting heavily on the convenience factor for sure.

One stop shop and drop. Not too many folks have the free time and energy to go about trying to sell a car.

How many of us are going to buy a used BMW that didn't come off the dealer's lot? I'm going to expect warranty, etc..., so CPO is important.

I once brought in my wifes 1986 VW Jetta to the dealer for a bad alternator, was going to cost me something crazy like $1,200 bucks, and I ended up driving away in a new identical Jetta, same color, etc.. only with a sunroof. They actually gave me a great deal on the trade-in for the new 1988 or 1989 model. In fact my wife didn't even realize her car was now a new one. The model had hardly changed in 3 years.

At least I didn't pay the $1200 repair.