One thing he does with many of his businesses is they hire straight out of the local colleges (wherever those businesses are based).. they do not pay the going rate for the position, but usually 20-30% less than the competition. Generally there are cost of living raises, and from this pool of people, they will find and promote managers, but there isn't really much outside hiring. People that leave the organization, will just be replaced on the next hiring cycle.
The one benefit to the people that work there, is they will not be fired or laid off, unless there is some real extenuating circumstances. (buying out a new business) They generally just don't do it.
Because of their lowball salary across the board, they do not attract the smartest or brightest graduates. They get the leftovers that didn't find a job somewhere else. In one of their insurance businesses, for example, instead of hiring software engineers from the IT college, they hire math majors instead. This skill is useful in Insurance and IT, but many math majors don't have a lot of job offers coming out of school, while the IT college grads have many offers, that they don't want to compete with. It's another example of how they screen for people who probably can do that job, but they will keep the labor costs as low as possible with this practice.
I got to see all of this as a consultant.. and I felt quite sorry for the people that worked there, but those that remained lifers there all value the safety of the position over the low salary.