I am not sure about that piece...but, they do have a job and that is trying to sell contracts....so, I get where they may be coming from in trying to convince a buyer that it is unrealistic...at least from their perspective.
As a buyer, it never bothered me, but then again, every time I put in a low ball offer I always stated, I know this is way low, has a low chance of being accepted, but this is where I am at, and if you would like to prevent it to the seller, great...if the seller isn't entertaining low offers, fine too.
I do also think that those who do frequent this board, and see some of the low offers that have been accepted, do see these as "market" and thus look at the selling prices as way off...but some of the data that has been gathered from the actual OCC website, has supported that many contracts out there at certain results are in fact, on average, selling for higher than some of the great deals here.