It doesn't have to be a killer answer that sounds like you just made it up, yet brilliant. It can be thought about, over time, and shaped into a precise, sincere statement. You also have to leave yourself open to modifying it as you gain experience.
What some of my friends said:
Linz: "For the love of the game "
Theo: "To teach the youth of today!"
Randy: "To reinforce all the best of what sports offers-short term and long term."
Allie: "I always felt like I had a really good understanding of the game and what each player could bring the game ... And I found it rare to find a well educated coach who knew how to let the players shine with their individual skills - rather then try and conform them to an "idealistic" view of what they think a player should be ... I just wanted kids to know that there is no such thing as the "perfect" player...everyone brings what they can"
Dancer: "Because I feel I have something to offer"
JJ: "To give kids the chance to be something great and to keep them from going down the path of peer pressure."
Carmine: "To teach the game as it should be played, of course."
Frank (not me) : "To try to generate the love I have for the games in the kids"
@7-touch-coachng: "I coach because I love soccer. I coach because I want to share my passion. I coach because teaching fundamentals is critical."
Randy has the unique task of introducing new high school students to football every year; teaching technique, physical training, coaching to compete and organizing a team at the same time, for a lot of students who have very little sports background. Victories perk up that school for days. He does good work.
My favourite answer was from my sister-in-law Andrea, who is not involved in sports : "To share in the joy of empowerment." This statement speaks to me of confidence, expression, ownership, enjoyment, etc.
Other writers offering their reasons:
http://timthefoolman.com/2006/07/13/why-coach/
http://www.soccernewsday.com/usa/a/327/why-do-you-coach-
http://www.powerbasketball.com/041002.html
http://hoopscoach.wordpress.com/2009/07/01/why-do-weyou-coach/
http://blog.coachdeck.com/2011/06/24/why-do-you-coach/
http://espn.go.com/blog/chicago/high-school/post/_/id/1813/coaches-roundtable-why-do-you-coach
OK. you know how to use Google too .... :)
So, here we are ... why do YOU coach?