If fair distribution is your concern then you should probably be more focused on the people at the bottom end making 20k-40k that could be making more. This article was not about those people.
Employers will only pay as much as it takes to keep you from leaving. At 150k a year the ratio of people who would be willing and capable of replacing you is pretty high.
You're saying that your salary has no affect outside of your company. That's it's all internal accounting. I don't agree with that.
Salaries will affect the price of your service. That price is paid by everyone else who doesn't work for your company and passed along. You are taking a bigger share from everyone.
Employers will only pay as much as it takes to keep you from leaving. At 150k a year the ratio of people who would be willing and capable of replacing you is pretty high.