The reward for doing a good job is more responsibility. Responsibility is reward. If we are responsible with the things that God gives us, then he will give us more responsibilities. We will receive greater levels of influence and importance.
Verse 29 is a tough one: Those who have much will get more, and they will have much more than they need. But those who do not have much will have everything taken away from them.' That's different from almost every other verse we read in the Bible. God wants to reward those who are willing to work. If you are willing to work hard for God's glory, then He is willing to bless you beyond what you will ever need. JM