Glory
High school coaches shape the lives of their athletes like Play-doh, in a way that college and professional coaches can't. You'll take young people with raw talent and transform them into disciplined, hard-working players. If you're good at your job, then you won't just teach the kids on your team the sport—you'll teach them the skills (and maybe some algebra or geography on the side) that'll stay with them into adulthood and, hopefully, contribute to their success, no matter what educational and career paths they end up pursuing.
Coaches who work for reputable college sports programs or professional sports teams are after different kinds of glory altogether. Namely, shiny trophies, national fame, and name recognition. However, they also get the humbler joy of helping to mold athletes into champions...which is good, because it's easier to do that than win the Superbowl.