@Gozpel, I do agree with you that Korgan should haggle over his price before rejoining. After all, his skills are greater, and (by his thinking) you've denied him a chance at more loot by kicking him out. I'm inclined to think they should have even considered adding some unpleasant minor quest--like a demand you allow him to fight Jaheira or Haer'dalis in a one-on-one to the death. (Of course, he might relent and let you resurrect his opponent if he succeeds.)
To the Righteous belong the fruits of violent victory. The rest of us will have to settle for warm friends, warm lovers, and a wink from a quietly supportive universe.