Because anyone that ever built anything worthwhile in this field knows you have to give it your all, when starting out especially.
Nobody gives their all for 5k/mo.
Nobody gives their all for 5k/mo.
I work in the EU for an American company. The consensus here is Americans work more, but not harder. We deliver better work in less time.
The edge Americans have is a can do attitude and not being afraid of failure.
Your perspective of "delivering more work in less time" is cute. Put yourself in a pool of 95th percentile of engineers on the market and you will soon find that your experience is not representative.
Not sure of the relative costs of housing in San Francisco vs Berlin, but it doesn't feel like a massive difference. Personally I'd rather live in Berlin on €112k net than San Francisco on $134k net