Another reason for an introvert to pretend to be an extrovert in order to become a leader: it's about the only way, outside the world of academia, that you might get a private office. Even then it's unlikely, but in my experience (in Britain) the days are long gone when it was considered a good thing for those with expertise to be able to concentrate, in some semblance of a quiet working environment. Now, the only experts who are respected are consultants delivering training in one of the various bullshit extrovert-orientated project management methodologies, because they teach how to cover up piss-poor work by blathering about it in incessant meetings. According to the new orthodoxy, everything else can be looked up on the Internet, and done (badly) by several off-shore workers, for cost of every one home-office-based expert, then the extrovert managers get to pull some mediocre compromise out of the chaos at the last minute. Much more satisfying (for them) than waiting for a true expert to go away (to their once-quiet offices) then come back and deliver a genuinely good, coherent solution.