Obviously it can be a bit of both. I’m sure a lot of those guys on Wall Street get off on the high stakes, competitive environment along with all of the benefits to being wealthy. On the other hand, some people choose jobs that don’t pay much but give them a high degree of satisfaction. But I surmise that most people, particularly men, are mainly motivated extrinsically in their jobs to provide for their families, to maintain a certain lifestyle, or simply to survive.
My partner and I both have jobs that “could” support both of us if one of us lost our job. Personally, my job is fulfilling about 30% of the time and the rest is just getting the paycheck. Thankfully, I really only work about two of my expected eight hours so it’s a pretty good deal lol.