Direct tv rules/pricing/ and everything else, something changes whenever the wind changes direction.
I don't suppose anyone unless you are directly in a department that has to do with the changes could possibly keep up with it.
Not to mention the misinformation that is passed around.
Hell, for that matter I have been told wrong by CSR's on commitments which I have passed on because it was what I was told.
That being said, I too thought it was $400
I usually now just make it a point when asked by customers to tell them I have no idea and that I just put them in. I am sure some will say it makes me a horrible installer and I will never be allowed to work on their house (and yes, I have done this way before every jumped my case about being wrong on stuff).