I think we are all deluding ourselves if we think that corporate agents from Rolex, LVMH, Richemont, Swatch Group and the rest are not well aware of exactly what our trusted "collectors" are up to. They would stop them if they could.
I would imagine that they periodically buy from them anonymously to gauge the quality.
In fact, I would not be surprised if they have even infiltrated this forum and the others.
The idea of someone strolling into an AD with a rep, and having it's repercussions blow the lid off our hobby is a little far fetched.
-Andy