> > But I did them for no money> And I assume you acquired the means to do that for free by.. doing the opposite for long enough to buy you freedom to do so? Or marry/born rich?
By working my butt off for over 30 years, making a rather humble salary, but never living large, avoiding personal debt like the plague, driving old cars, or crappy company cars, living in apartments and a small house, saving 25-40% of my earnings, investing in conservative, yet still a bit aggressive, funds, and then, after leaving a job I stayed at for nearly 27 years (at a famous Japanese imaging corporation, that makes optical equipment), being rejected (sometimes, quite rudely) by every place I applied at, for being too old.
The first project I mentioned was done over a period of ten years, as a "side project," while I worked as an Engineering Manager (a job I hated). I did it because my life was, literally, saved, by an organization, and I wanted to Give Back.
There are many reasons to do things that don't involve avarice, ego, anger, or cynicism. I want to make the world a better place. My resources are limited, but I have some ideas on ways to multiply my impact.