So let's say you're upgrading mages from level 3 to 4. 3's cost 2500 and 4's cost 3000.
If you queue level 3 mages for 2500 a unit in barracks when camps are full and wait until research is complete, do you get 3000 back from the level 4 mages when you remove them from queue? Or 2500 again instead?
Cause I would make a good amount of profit after each unit upgrade. :o

