They can tell you things you would not believe.
I was at a conference put on by the church I attended at the time, and afterwards, one of the speakers mentioned to me privately that he had just been laid off - and rather brutally, IMO - by the Koch's operation he had been with for some time. This gent was a very solid guy, and he warned me that the Koch's were wolves in sheep's clothing. From that point, I have found his warning to be valid.