Charisma is your friend:
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So what does Charisma really get you? Well if you have a low charisma you
may not be able to get NPC's to join you, if you pass a quest, the treasure
may not be as good as it normally would be, (or there may be no treasure at
all!) and shops WILL charge you more. So don't skimp out on the charisma.
On the other hand, you only need ONE PERSON with good charisma, and it
needn't be your main character.
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Hmmmmmm...Yes, that must be it