Millennials value purpose over money
Work for work's sake holds limited appeal to a generation that anyway doesn't believe it will be able make equivalent income to their parents.
Western 20th Century culture put a huge premium on work for work's sake and on financial self-betterment. The American dream was to reach a higher economic status in life than your parents, and Margaret Thatcher (UK Prime Minister, 1979-1990) is said to have declared: "A man who, beyond the age of 26, finds himself on a bus can count himself as a failure".
Millennials have reacted against that explicit 20th Century materialism, and have placed 'Purpose' - social, environmental, psychological, political - at the heart of their quest for self-actualisation.