Those are a couple of lucky fellas...
I see it from both points of view. Emotionally I would feel like they are getting a free ride. But then again they have permission and it sounds like it has been going on for sometime.
On the other hand, if all they hunt is for 3-4 days and manage to kill good bucks they must be good hunters and know what they are doing. In that case count your blessings. Where I hunt all kinds of people can come through and I can't do anything about it. I would be happy to have only a couple of people that knew what they were doing go about their business and then leave after 3 or 4 days.