From a thoughtful piece (with an ill-chosen title) on "work-relevant characteristics of online life":
Intrinsic rewards matter most.Read it all:
The web is a testament to the power of intrinsic rewards. Think of all the articles contributed to Wikipedia, all the open source software created, all the advice freely given — add up the hours of volunteer time and it's obvious that human beings will give generously of themselves when they’re given the chance to contribute to something they actually care about. Money's great, but so is recognition and the joy of accomplishment.
Gary Hamel, The Facebook Generation vs. the Fortune 500 (Wall Street Journal)