http://www.teamusa.org/USA-Taekwondo/Features/2016/July/13/Be-an-Honorary-Team-Captain-in-Rio

For details see the USAT page - cost $30,000 donation - go as part of the delegation in an honorary capacity.

Last Olympics Eric Parthen raised close to $200,000 if I remember right - which was the good news.  The bad news came with all the press releases and photo ops from those going as Honorary who were sharing with the world they were the Team Captains or Coaches or how they were going to bring gold home to the USA.  That part did not go over well.

Handled correctly, it can bring in a lot of money.