I have a 'Secret' clearance also (I am graduating with my BS in Computer Science in two weeks) and I currently work out at Lockheed-Martin on a software engineering project, but I don't think that its an instant 80-grand/year.
It is a benefit though, no doubt. Entry level jobs are still closer to 50K-60K/year.
EDIT: I should add that I am not in the military. I got mine as a civilian.