This is the real reason. A universally beaten-down workforce is how you keep people working hard for the minimum pay. One new employee being paid more than the others from the get-go isn’t anywhere near as damaging to the bottom-line as one employee getting a nice raise and inspiring the rest of the office to demand one as well. With the taboo against asking people how much they get paid, nobody will ever know that the new guy gets paid more, and soon enough even they’ll get paid well under what they’re worth with inflation constantly rolling away.