It's probably because if you are anyone in the public eye, be it John Eberhart or Dan Infalt, or whoever, you will always get people wanting to engage you to argue just for argument's sake. My thought is that he puts out content and lets that stand as it is. Otherwise, you are just getting into one argument after another with an endless stream of folks on the internet.
I'm sure that has a lot to do with the Tethrd guys staying away. How many times do you have to hear "my platform squeaked and ran off a 300 inch buck and you ruined my life", lol.