Do you have a link proving that they get this "preferential treatment" in their careers in Lincoln. I know fans will be fans of these players because of the school they produced stats for, but I can't think of any bank that will qualify a player for a loan simply because he was an all conference player. I don't know of anyone who donated a building/facility to a player for his business because he was an all american player.
Truth is, there are a bunch of ex-huskers who stick around shortly after graduating and/or leaving the program. They have the local fame but they have to work just like the fans who pay to see them every Saturday. Some of those players become, business men, some family men, some even become criminals. But that is because of their own actions and choices, not because they are ex-huskers. You are putting too much weight on being a football player for Nebraska.
One more known example.....when was the last time anyone has been to Scarlet & Cream Letter Club Restaurant. I believe an ex-husker owned or atleast ran that business.