What one chooses to share with others of his knowledge and experience is always a personal decision.
I, for one, choose to share my 3 decades plus professional and academic knowledge routinely with others free of charge (one example: http://www.epaalumni.org/Classroom/
). Why do I do it? Certainly not for ego, money, or acclimation. I'm embarrassed, frankly, even to be referencing it here (with 8 or more years here now, I can't even recall previously referencing my day job skills). I do it because I believe in it, in sharing the light, and in helping others in this way. This is my personal decision for myself that no one else must copy.
And so, my friends, let's not paint with too a broad brush generalizations on sharing or not sharing one's knowledge and experience. Surely we can acknowledge and respect another person's different limits without projecting them universally. That's all I want to say now on this topic because were I to truly speak freely and further now on the topic at hand it would burn off both of your ears and that would absolutely not be in the spirit of the Grateful Dead.