A combination of things: I had a conversation with Joel Spolsky which convinced me that people with the opportunity to contribute a lot to the world have an obligation to do so. (He grounded this in a Talmudic understanding but it largely comports with me as a Catholic, FWIW.) I've found myself vastly more interested in doing work when work impacts meaningful problems that I care about, like e.g. changing hiring in the tech industry or making entrepreneurship a transformatively better experience worldwide. I have at times had some not-so-happy health issues to deal with and when not dealing with them my tolerance for a more traditional workweek is rather higher. As I get increasingly far from my salaryman days, my raw distaste for things-that-feel-like-work declines.

I wouldn't primarily credit attitudes about or desires for money with any of this, though my personal burn rate is much higher now than it was in 2010. (I got married, had two kids, and moved to Tokyo; this makes ~$10k spend like ~$2k used to.)