These numbers are absolutely insane. In Poland 300 EUR per day is a good senior level salary. If I earned 10k per day, I'd quit after a year, but a medium house, and live very comfortably just from a 2% interest rate for the rest of my life.
You're in Poland.. In California there are certainly (probably less than a few thousand) people making these rates. They've been there 20 years and are principals and above.