alterboy:
The dealer has to make some money off of the sale, too. There's no incentive for him to buy it from you for 13K and then try to sell it for 13K or hope he can make that much from auction. Also, they will still need to be priced for sale far enough below the new car prices to make them attractive to potential buyers.
I traded my 2010 Soul Sport in a few weeks ago when I got my 2014. It was just shy of 100,000 miles, but we managed to coax $7K out of the dealer which was only $128 and some change shy of paying it off. I was happy to get that much for it considering that KBB value was about $1500 less considering the mileage and wear. Sometimes it comes down to who the dealer is and what your relationship is with them. This was our 4th Soul purchase from them (5th Kia purchase), but only the first trade. They also know that we'll be back soon enough for another one.
As for the manual transmission... That has been a point of contention for several members on here lately. I would have gone for one in my 2014 if it were available and (bigger if) if my wife could actually drive a stick. They are only available on the base models with the smaller 1.6L engine. The automatic does come with the option where you can move the shifter to the left and then manually go thru the gears. I will agree with many that it isn't quite the same feeling.