Earlier quoted context omitted.
It's the cost of living. The cost of living in the SF baybarea is 79% above the national average. A living wage is simply more here because it costs more to live here.
If all the major employers in the area cut wages down to $80k, wouldn't the cost of housing be forced down too? Who can buy a house for 2.2 million when making $80k. And on a side note, there are many companies in the area that pay $80k and less, oil change mechanics for example. So it's not like you MUST pay that SV wages because cost of living is high. I have a feeling it is due to high demand for those workers.
Also, SF is already over 60% rent controlled housing, so the cost of living for over 60% of the population is already being artificially reduced beneath the market. It's also interesting to note that the income level to qualify for rent controlled/stabilized housing is 77-160k a year depending on household size.
It's astonishingly expensive to live here compared to much of the rest of the country