I would not fret over a perceived few lost bucks on your used Cobalt parts. There's not really a set market for those things; it's worth what someone thinks it's worth. I felt fortunate to get $600 total from a guy for my '09 SS seats (one was bent up a bit from the accident) and all the plastic bits from the interior. He also came back later and paid me $150 for the rear axle beam by itself. On the other hand, I only got a combined $75 for the rear bumper covers from BOTH of my donors.
It's a matter of having the right parts available to the right buyer, at the right time.