> He left, over two years quadrupled his income, and now I work for him. I doubled my income.

This is such an American story :-)

I don't think there's any other developed country where you can remain an individual contributor, a developer, and quadruple your income in 2 years. Heck, in most other developed countries the whole salary range for a profession is about 2x, from the lowliest junior developer to the highest senior developer. To make more you'd have to become a consultant, so basically start your own company, which is an entirely different kettle of fish.