Perhaps a naive question, but why are US salaries so significantly higher (often 2x) than UK salaries for the same jobs, e.g. in science and technology? I know that UK gets NHS and more holiday time and maternity leave than the US, but can that really make such a big salary difference? I also know that private (fee-paying) uni education is insanely expensive in US (state unis are much cheaper), but in UK the cost of fee-paying schools for children up to Year 13 isn't exactly cheap either!
For those of you who moved to/from the US by choice, was the increase/decrease in salary among your main incentives/concerns? Or did salary not play a big role for you? (Perhaps other factors like being near family were more important.)