why would a fighter use a staff = [BG3] because he wants to cast Bless and don't overwise have that spell... yes its in the game
[BG2] because the fighter is also a thief and staff allows backstab [BG1] the +3 staff is one of only 3 weapons that have better than +2 magic and not cursed + you don't have to kill Drizzt
[any game] from a role playing view your Fighter just wants a staff because you feel she should
Luke Skywalker: I don't, I don't believe it. Yoda: That is why you failed.