This isn't a nation-wide survey, nor does it even pertain to math/engineering/physics degrees - which is what the discussion was about.
I can believe that biologists, chemists, and physiologists with a PhD don't make much - because those with a BS in those areas don't make much on average. ($25-30K joboutlook.com again). The survey you posted is weighted heavily in those 3 areas. How about finding a nationwide survey that breaks down the salaries of PhD's according to field? You are finding obscure irrelevant data from a small cross-section and posting it as if it means something.
Quit complaining and post a link to a national one. It's not as if Stanford is famous for being stingy - quite the opposite.