I have been running an open source MathJax-based mathematics pastebin[1] since 2012 and I had received 2 donations for it until recently. Then a mathematician tweeted[2] about it convincing others to send some donations. After that kind gesture by him, I received 3 more donations. So pretty sure I can't make a living out of donations. :-) But I still appreciate them because they help in covering a portion of the host…
I'm stupid , but what exactly do mathematicians do ? I'd assume economists are a significant portion of them ???
The mathematician was tasked with calculating the areas of manhattan that would be hit during stormy weather and give a rough estimation of the required drainage for the water to seep away.
That's the rough details, can't remember exactly. However, it always struck me as a job where the "mathematician as a job" fit really well.