Mentorship may seem useless at first, but if you think about it a little bit more..
Socrates – Plato
Plato – Aristotle
Henry David Thoreau – Ralph Waldo Emerson
Obi-Wan Kenobi – Luke Skywalker
Ra’s Al Ghul – Bruce Wayne
Gandalf – Bilbo, Frodo, and the rest of the fellowship of the ring
Mentor – protégé relationship can bring great impact, even life changing. I guess..