I have only bought Hermes scarves, no leather goods or handbags, and have only bought them online, mainly secondhand. Of the four Hermes stores I've entered in person, three in the United States and one in Europe, I've had two where SAs were available to answer questions and showed interest in engaging me as a customer. In the other two stores, it was unclear how you go about getting helped or whether there's a sign-up list.
I must admit I'm torn about whether to keep buying scarves. I like the designs and find them really enjoyable to learn about, and that's what has kept me interested. Typically, though, I would like to then experience an in-store purchase for the complete experience and to see current offerings in person. However, I would like the in-store experience to make me feel good as a customer. I have to ask myself why I would intentionally put myself into an uncomfortable shopping situation, when the general idea of accessories shopping is to feel good about oneself and the object and the experience. This is a very interesting thread and underscores to me the commitment and loyalty of many Hermes fans despite less-than-stellar customer service! Or perhaps my expectations are just not in keeping with the Hermes sales tradition at present.
If you have a local store you'd like to establish a relationship with, my advice would be to go in the morning on a weekday. In my experience, the SAs are typically more available to work with walk-in clients then because they are less busy, and have more time to show you things and chat.