I actually had my first experience last week being a bit put off by the SA in my local store. I've been an Hermes customer for years, having purchased my first scarf in Paris in 1985. I've collected H scarves ever since, often buying them when I travel. Still, I've purchased several locally, along with SLGs and fragrance.
Earlier this year I decided I wanted to purchase my first Birkin. I started doing research, but of course it's difficult to try on the bag when there are none on display in store. I did my best to do research online and once I narrowed my selection down, I put my request in with my SA when I was in the store buying a belt.
Many months later, I hadn't heard anything, so I decided to check back in at the store. It was my birthday and I figured you never know - I might get lucky...

I waited patiently for the SA (who was not the one I'd worked with for the belt, but whom I have bought scarves from in the past). When I asked about the bag, I actually felt a wall go up. She told me they have no bags, no list and she couldn't be of help. When I mentioned that they had taken my name in the past, she continued to act chilly but finally asked what I had bought in the past.
I have to admit, I was quite surprised that they are unabashed about this. How much does one have to buy to qualify as worthy of the bag? I was standing there in the store, wearing their products. I was polite and patient. I asked a SA for help. I would think it's more important to be loyal to the brand than to one individual in one local store.
I'm not easily intimidated in this type of situation. I worked as a designer for 25 years and shopped in many parts of the world as part of my job. I'm pretty comfortable researching and buying luxury products. I hated being made to feel that being eager to spend $11k on a bag is not enough to make the cut. I left and promised myself to shop NY in the future (I live outside the city).
It just makes me wonder how one is supposed to gain expertise about the product if the SA is unwilling to be helpful. My knowledge in the past has been about scarves. I know the artists, I know the patterns, I know the color ways and the dates. What I don't really get is why a new and genuine appreciation for a particular bag should be dismissed by the same company I buy so many other things from, just because I buy them where and when I see them, which is not always in the same store. It's ridiculous for me to buy other products that I don't want, just to build a rapport with a particular SA.
Up until that point, I was certain I wanted to buy a new bag direct from the store and was willing to wait my turn. Now I'm not so sure. Do I really want to allow someone to treat me like that? That goes against my nature because I want the bag because I really love it, not because it's so hard to "qualify" for. Ebay is starting to look much more appealing... (but it makes me nervous from an authenticity standpoint).