Even after paying $600,000 per employee, Facebook still makes $600,000 profit per employee.
So it is currently at a 50/50 split of the value created between the employee and the company.
I would expect, in a skills shortage, that the employee would be able to demand a much greater share, something closer to -- or even temporarily above -- 100%.
The absolute number, $60,000 or $600,000 or $6,000,000 doesn't seem relevant.