There is actually a wellspring: quantitative finance. There were many people drawn by the allure of finance back in 2006-2008 and are now thinking of leaving.

There is actually a wellspring: quantitative finance. There were many people drawn by the allure of finance back in 2006-2008 and are now thinking of leaving. Generally people have enough money to carry themselves for some time on a low salary, have the risk tolerance (after all, they can cover themeselves), and can work at all hours.