I think there is definitely a stress ceiling after which I wouldn't accept any paycheck to let me do the job. But this is my personal opinion, I would imagine more stress => less demand on the job market => higher paycheck. For me, money isn't the end goal, but a necessary part of the adventure. When you play RPGs you don't try to make crazy money, you make enough to buy things you want in the game. That's kinda sorta how I see my financial situation.

I hear you... Money isn't the end-goal for me either. I'm just hoping I'll be able endure the stress long enough so I can retire early (at age ~50) and enjoy a virtually stress-free retirement but we'll see...

The other element I always consider is the risk. Right now the GP knows the amount of stress the job causes. Changing jobs has risk about his/her ability to estimate the stress caused by the new job.

I have a tendency to ignore things like stress (hard to measure) when selecting a job while overvaluing things that are easy to measure.