[Rebka]

This one is more directed towards the teachers involved in the teams:

Teaching: we're not in it for the income; we're in it for the outcome.

There are also the following:

Sacrifice is giving up on something good for something better.

From the musical Newsies: If we stand as one someday becomes somehow.

From Thomas Edison: Opportunity is missed by people because it is dressed in overalls and looks like work.

From Downton Abbey, for all the mentors plagued at some point by students who think they don't have anything to do: You are a [person] with a brain and reasonable ability. Stop whining and find something to do.