I think the distinction here between low and high-end MF operators may not be just that they're MF operators at certain experience level. At a number of companies, I've seen that the people on top have a thorough understanding of the applications the mainframe supports and are critical for making changes that don't break it. Not having them any more could make stuff stop working. So, it justifies their higher pay plus job security.
You think that might be the case for the high-end MF operators in general?