@Iluviaporos - I don't know. It sounds like they at least get discounts for their families. And if they know their way around the deals from work, they probably know how to get the best deals for themselves.
I've had trips where I got really good deals and they were almost as cheap as staying at home. If you throw in the huge discounts that travel agents can get, it might be cheaper to travel with your family than to feed them at home.
And if traveling is your passion, it pays to have a job where they aren't going to penalize you for doing it. There aren't many jobs that flexible, let alone encouraging about travel.