How does the bay area stack up for the more average bay-area-tech-worker once you’ve factored in cost of living? It’s very confusing for me because the COL basi

How does the bay area stack up for the more average bay-area-tech-worker once you’ve factored in cost of living? It’s very confusing for me because the COL basically makes a double salary equivalent to where I’m currently living. I’m confused, though, because any additional income on top of that salary isn’t necessarily affected by COL. A vacation costs the same to the same location, for example.