This is not terribly informative until expenses and safety nets are taken into account. Someone living in the Netherlands may have that 20% lower median income but being able to rely on public healthcare and get around without a personal vehicle does wonders for one's sense of peace and agency. That likely counts a lot more towards personal wellbeing than the addtional dollars in your account especially when health concerns can turn into financial concerns quite quickly.

The comment I am responding to is "because America's not rich; like 100 people here just have more money than most countries" not whatever you think I am responding to.