> These numbers are about 60% more than corporate salaries where I live, but the cost of living in SV is roughly 3-10x greater.
Your point doesn't necessarily follow from your argument. For example, if salaries where you live were $1,000,000 per year and the cost of living was $10,000, you would gain $600,000 per year in salary and lose up to $90,000 per year in costs, for a net profit of $510,000.