There is a psuedo-empircal monetary value to enjoying life. Consider a thought experiment where you plot "free time" or "enjoyable time" versus "salary." Now consider a job where your enjoyable time is ~ 0, coal miner 100 hours/week, for example. How much would you need to be paid? Now maximize the other dimension, how much salary do you need to live, but have a rewarding and stimulating job?

For me, the numbers are like, $1M a year and $50K a year. This means that if I manage to maximize my enjoyment axis, I'm an enjoyment millionare. My personal goal in life is to be on the manifold that connects those two points.