I agree with the reasons given.
I have bought several snakes off of a breeder that is local to me.
He has a great rep, produces excellent snakes, and I have no reason to see his 'facility'. When I start selling my snakes. I doubt I will let people into my house. Key point, most breeders have a home and not facility.
On the flip side, I have adopted a few snakes off of sites such as C-list... and it is important for me to see how the snake is being kept. I need to know if it has proper husbandry.
I have gone to people's homes and you know they are uncomfortable having a stranger in their house, and it is just a really unpleasant experience for everyone involved.
Bruce