More than greenbacks

Sometimes, motivation isn't best served in the form of money.

To quote Bill Gates,

'I never took a day off in my twenties. Not one. And I'm still fanatical, but now I'm a little less fanatical'

If you're interested, here's the entire Bill Gates interview.

Money can motivate you quite a bit, but without passion, you won't be able to go far.
So that explains why we need rewards!