The reason, by the way, that leadership is often correlated with extroversion is more to do with American ideals of the perfect citizen since about the time of Dale Carnegie than due to any actual results.
In fact many successful CEOs are introverts, because deep critical thinking and mediation tend to be useful qualities, surprisingly enough.
Not in finance though. And the world of finance has had a smooth ride, alright.
Actually think it has more to do with the fact that extroverted people are more persuasive and generally voice their opinions more. Some of it is just in the numbers...if you know more people you have a strategic advantage of more opportunities.
There is no way around it, from the numbers. That doesn't make them better or worse.
We all have our part to play.