A developer is worth whatever the local market pays at the time to retain them. If you have a look at housing costs in the bay area/Seattle (close to work 2000 sq ft ~ 2 million US dollars), you will understand why anything below 200k makes almost no sense in these areas for an experienced dev, and why 400k+ is fairly common.

I agree with you - hence why it is very hard for early stage startups to give meaningful offers in the bay area.