Last poster summed it up beautifully. You mentor without compensation, acknowledgement, or expectation that it will be recognized and fiscally rewarded. You do it based on a deep entrenched value system that recognizes potential talent in the raw and desires to help shape and grow the individual/s to their fullest potential.
People say that being a teacher is one of the noblest professions, but I beg to differ. That accolade is reserved for those that learn, then DO in the real world, ultimately culminating in a position where one can mentor the next generation on the job. We have a great deal many highly educated morons in this company with zero work ethic. We don't make money by cramming for tests, we making money by doing actual work.