Glory
If you win the Olympics, you're America's sweetheart. Plus you get the nifty medal as a keepsake.
If you win, the entire nation will love you. You'll be a hero. Millions of little kids will want to sign up for gymnastics lessons the very next day so they can be just like you.
It's truly a glorious undertaking.
Of course, if you lose, nobody's really going to care that you can do one and a half twisting-Kovaks in a row.