Such a shame especially for genuine buyers.
Building a relationship at the AD also is a risk. What is the turnover like for an AD? To have build up a relationship only to have the salesperson move on to another shop or career would be such a pain.
If you buy from AD, your purchase is recorded in the system under your name. Even if the salesperson change, your record stays in the system. They can always check in the system for your history.
Regardless how much you buy from grey market, you will still pay market price or if you're a really special customer maybe you get a little discount but still above RRP.