Points to consider:
All human motivation is basically selfish, i.e. people do things for their reasons not ours.
All people are motivated and they will continually move either towards or away from all propositions.
You cannot motivate other people because all motivation comes from within.
People’s motivation is constantly changing in response to their ever-changing personal priorities.
To utilize others motivation, find out what they want and why they want it and then convince them that you are their best chance of getting it.
MONEY IS NOT A MOTIVATOR, HOWEVER LACK OF MONEY IS A BIG DE-MOTIVATOR!
Worth a thought, MR HERZBERG?