I think there must be a deeper purpose to be motivated by than just money. Otherwise it is pure prostitution. I guess I too could do something more lucrative than what I do now, but personally I'm not that much of a whore. I want to do something that earns me money but I don't have to call it work.
But my perspective may be totally different. Having grown up in hard-core communism, I had pretty nasty conditioning about money, so I had a bit of mess to clear up in my head when I defected to England in 1988.
Now I believe in money as a tool for value exchange. That is why I charge for perceived value in my work, not for dispensed time. Clients make a fair investment in a future we create together.
To me the great motivator is freedom and the opportunity that using my brain I can help other who are willing to help themselves, that is, willing to invest in themselves. No investment no return.
Cheers
Bald Dog