Yes, you're right, he's rich. Skilling will not need the 12 cents an hour he'll get for peeling potatoes, scrubbing toilets and swabbing the concrete floors. But then again, it will be the first honest work he's done since he joined Enron.
Jeff will in all likelihood get a cushy pen where he has access to entertainment, library, recreation, and plenty of visitation from loved ones...still 24 years, wow! First time armed robbery is usually just a 7-year stretch in the slammer. (Of course, I'm assuming that Skilling will be subjected to parole terms after a four-year confinement.)