Because it enables Hilzoy to tell the truth:

I have been hearing for years and years about how the financial services sector pays such exorbitant wages because the people who work there are so immensely talented that they are cheap at $50 million a year. I never particularly bought that line before. But I never imagined that all those Masters of the Universe would do quite this badly. If we had paid them $50 million a year to go far, far away and leave our financial system alone, it would have been a bargain.