At least where I am from it is very strange for people to talk or write about what they earn. No one would tell you even if you would ask usually. Not that anyone would ask. But yes, have made that and know plenty of seniors that do. They would not boast about it though while, but that is the HN echo chamber maybe, everyone in the US spends solid amounts of time talking and worrying about it?
It is not so easy to legally immigrate to the US. It is long and involved process, and then you're usually more or less stuck with the company that sponsored you, at least for a while.