Extremely low compared to what? I’m in a competitively paid position as a principle developer for a large London technology company. Not renowned for high salar

Extremely low compared to what? I’m in a competitively paid position as a principle developer for a large London technology company. Not renowned for high salaries, but also not bottom of the market. Most people I know in basically any other industry make less money pre-tax than I have left over after tax, deductions, rent, and bills. I’m sure I could find things to do with more money, just as anyone can, but I definitely hit the point a while ago where more money would significantly improve my level of happiness. Given that, why would I pack up my entire life and start over in another country?