I think everyone should be highly suspicious of charisma. Charisma is a skill, not a trait, and it's developed by spending a lifetime practicing on people that one thinks are largely beneath one's self.
I think Charisma is a trait, not a skill. It is an aspect which just makes people "want to hear you". And that is extremely risky: Charismatic people can make everything sound good. They can hold the most dumb and unfounded position in an argument and still win, just because they are charismatic. And that is dangerous. One charismatic person can make for a meteoric rise of a company or he can destroy everything.
That's a pretty cynical point of view. I've met plenty of charismatic people who wouldn't think they're spending "a lifetime practicing on people that one thinks are largely beneath one's self". And then I've meant charismatic people who are full of themselves as well. Charisma and egotism don't go hand in hand ...
Don't confuse charisma with extroversion. Being an open, warm, inviting person is not the defining characteristic of those who others readily identify as "charismatic" rather than a "really nice guy". Charisma is first and foremost about impressing others with your charm, intelligence, wit, etc. The skilled ones hide their contempt and egotism well.
Charismatic people are naturally drawn towards those they can impress. The easiest people to impress are those they can best. Charismatics don't hang around people who overshadow them.