Some people thrive on "solving puzzles", which is sort of what engineering is. For better or worse, there are an infinite number of puzzles to solve.
I have never looked at work that way and I even quit my last job partially due to moral qualms I had helping a company I didn't believe in. He seems to think all I want is money, but that is the third priority for me following challenging work and contributing to a company that makes the world better. My father has never been all about money, but he never would have gone to work for anything but money.
He was even offered to interview for his boss's boss's job last year (C-suite in a conglomerate), but turned them down because he was over the rat race. Anecdotally, they told him they would 'overlook his lack of an MBA since he had 30+ years of experience' to which he replied 'that's good, since I don't even have an undergraduate degree.' So I suppose it's never been about money, so much as what the money enables him to do outside of work.
He continues to urge me to take a job, any job and just be happy with what any manager does to me as long as I get a paycheck. He was baffled when I quit a decent job to be unemployed. I can see his points and I often wonder if I am doing it wrong. He purchased a home in his late 20's after getting married, had 5 kids, very involved with his church, and has always had personal projects he spent his weekends working on. Even if I didn't go to college, those things would still be out of reach for me.
I wonder if my generation has just been instilled with different values or have we just been prevented from having the fruits of our values (homes, kids, etc)? Are we (I) just trying to fill the void because the truly wonderful things in life are more out of reach than they were for the Boomers? I really wonder how my father would fare if he was born in the same generation as me.