You can argue that glassdoor and other online surveys are self-selecting and suffer from this or that bias, but at least they (presumably) are trying to back their results up with data. Multiple online sites agree that a median & average Senior Software Engineer BASE salary in the Bay area is between $130K and $140K [1] [2]. If you want to say this is wrong, fine, come in with some other actual data rather than just hearsay and doubt casting. If you want to say "but that's just base salary" also fine, but show some total comp data with a sample size greater than N=1.
1: https://www.glassdoor.com/Salaries/san-francisco-senior-soft...
2: http://www.payscale.com/research/US/Job=Senior_Software_Engi...
No?
That is why it's not commonly shared and proven like you are asking for. Try putting yourself in the other person's shoes.