All the answers are bullshit. The real explanation is that leaders set salaries. Of course they’re going to value themselves over others. Then they’re going to rationalise it with the bullshit you see in this thread about “force multipliers” etc… it’s basic capitalism. It’s the same reason politicians in the us have free healthcare and great vacation and benefits and salaries rising above inflation, the people who control these things always make sure they get what’s fair then make excuses for why no one else does.