You can certainly work on yourself to be more valuable if you're employed. You can also work on yourself to add more value if you're in a band :)
If someone is content with how much money they are making, that's fine. For anybody out there wanting to earn a bit more, my advice is to focus on creating more value and they will figure out a way.
As for CEO salaries, I'm positive not a single one of them would suffer from being slapped with extra taxes on their already obscene paychecks, haha.