Is someone making $80,000 for doing 60 hours a week of highly-skilled, highly-profit-bearing work "overpaid". In my opinion, that's underpaid.
If anything, we've seen recent evidence that SV salaries are "deflated" compared to other industries and areas of the country, due to collusion, frequent targeted hiring of very young, often naive grad, inflated time at work, etc.
I don't work in SV, for the reasons I outlined above, so this isn't some kind of self-justification.
Edit: To be clear, I don't disapprove of people working there, I know it's beautiful and a nice place to live. I'm actually defending SV engineers from accusations of "inflated" salaries. It's just not a good place to go to get rich as an engineer with a family.