IMHO Charisma requirement to be a customer of doctor or trader is a complete and utter nonsense. I see Charisma more as general stat that determines your character leadership abilities and abilities to influence other people. It does not necessarily have to mean your breath smells and you are rude as hell and socially unaccepted. Otherwise it could mean that in prison or some criminal ghetto Charisma could be reversed, which is weird. That's why I think it's more that you simply are a "sheep" not a "lion" and do as people tell you.
And you don't go to doctor or trader to influence anyone. You go there to give your money for goods or services.
But that's my personal view
