I have a friend who has a PhD in chemistry and is an investment fund manager and makes a boatload of cash.
Of course, the real answer is that people should seek fulfillment, and that may come in different forms to different people. I need some degree of financial security - that is just my personality and probably arose from prior periods of financial insecurity.
Now that I have some degree of security, I often find myself wondering what it would be like to do something that I thoroughly enjoy rather than to be something that I enjoy some aspects of (the intellectual challenge, the flexibility I normally have in my schedule, some of my working relationships) and hate other aspects of (the occasional loss of control over my schedule, the loss of esteem in my profession, the need to constantly develop or reinforce existing client relationships, etc.).
I honestly think that I might be happier with less, and it isn't like I am flying first class or staying at the Ritz Carlton. But I will keep on doing what I am doing because I have kids to protect and because I only have 15-20 years left in my career in any event.