Depends on the profession. As a software engineer in Eastern Europe, you can work for a Western company remotely and make kind of insane money.

I lived like a king in Warsaw (renting a small apartment in the historical centre, eating out often) spending about 1/20th of my income.

These days I work for peanuts for my friend back from kindergarten and am enjoying it tremendously!

That's what I was doing as well (only in Bytom lol, to have even lower life expenses), till I retired at 41 years old. But, software engineers are an exception. Everybody else is pretty much making local salaries, which are lower than american ones in terms of purchasing power.