Because everyone who "knows their worth" is willing to endure a poor work-life, subpar healthcare, inferior education for their children, volatile social climate, practically non-existent social protection and crazy wildfires in exchange for a higher salary, right?
Well I can say most of that is hit or miss, and some just downright wrong. Crazy Wildfires is the only correct issue here, lol.
The actual Hospitals and Doctors in America have always been hands down better. Its only if you can afford it. Really any top tier Silicon Valley job is going to come with pretty good heath insurance. The Subpar Healthcare is more or less a poor person problem. Nothing like destroying net worth like having to go to the doctor with sub par insurance. Getting 3-6K+ in bills over a few nonsense visits.
Like I said before I wouldn't move to America either. But to think the EU isn't a$$ Backwards in many ways would be an understatement. I lived in the UK for 3 years, and like most of Europe school system is a hit or miss depending on location. Private Schooling is not uncommon in America for that reason.
This in part is why Americans in higher level careers (family's with income of 120K+) tend to retire with more money in their retirement accounts than their EU brothers. Nearly all my Fellow successful 30yo's had over 50K in their 401k when they turned 30. The ones that didn't are ones that will most likely always jump around to different entry level jobs.