Well, my main characters alignment is True Neutral....and...well, I always use to play with a ''good'' party, in BGII at least
Chosen
Because there are only a few potions of mastery thievery in the game, and because, unlike the other skills, 100 is just a number--not 100%. You need something in the 160-180 range to succeed against the host at the Copper Coronet, for instance (though he's at the high end).