Earlier quoted context omitted.
Something I never understood about this attitude ("... then I'm absolutely willing to work for less pay ...") is: why there are almost no examples of such behavior in other highly paid professions, such as physicians or lawyers? Very rarely you'll find physicians saying "I really want to become a brain surgeon, I'll happily take 40% less than my market rate". You'll certainly find physicians doing volunteering, but t…
I think there are. Teachers (pretty much as a whole) and public defenders seem to fit here. I know multiple photographers whose passion is landscapes/nature and only grudgingly supplement that income with weddings/portraits.
In other words, teachers are not willingly giving up a portion of the compensation that they could otherwise be making doing the same job somewhere else. In software instead, that happens ("Oh, you work on FOO v2.0, I'll happily take 40% less than what I could otherwise be making doing this job in another company").
I don't know about public defenders, you might have a point there.