I personally don't care if the salesperson knows every little intricacy about the watch because if you're purchasing a gen of any type you should do the research yourself and not count on someone getting paid $19/hour to figure it out for you. The Tourneau near me knows me by name, sends me catalogs, etc simply because when I buy a watch I've done the research, I know what I want, and I make my purchase...they don't know I'm a WIS or whatever but they know that I make purchases every few months and they probably figure (rightly so) that I'm a collector.
Some of the salespeople there are extremely knowledgeable, some aren't, but at the end of the day their job is to sell me a watch and provide after-sales service