Not at all, I think you are misunderstanding what I'm trying to say here. I am saying that the real upside for staying in private sector comes from the potential to hit senior managerial levels. These numbers are just provided based on my observation of a typical career trajectory of someone who reaches senior managerial level somewhere in his 50s. If you can't get them, it is highly unlikely you are going to reach that level in the future.

It would be unrealistic to expect an average CS person to meet the sort of pay trajectory experienced by a corporate high flyer destined to be senior managerial. Generally to have that sort of trajectory you will need to be a good performer with a CEP of at least MX8 which is beyond the reach of most public servants.