These are the 3 factors that lead to better performance & personal satisfaction, according to this is great presentation from Daniel Pink (the animation on top of it is pure genius) :
Drive: The surprising truth about what motivates us:
This presentation provides a lot of clues of why OWASP leaders/contributors work so hard and in fact why they love OWASP.
Basically OWASP gives them these 3 things: Autonomy, Mastery and Purpose :)
Here is the original presentation from Daniel Pink (which is 40m long):