In my experience, I get much better service when I'm carrying Chanel. When I went to the Chanel boutique to buy my first Chanel a couple years ago, I was carrying the LV Manhattan GM and the SA didn't even say hello. Then when she realized I was in the market to buy, she suddenly became super friendly. The next time I went to the boutique I was carrying Chanel and the SA came over to greet me and he kept showing my new bags that came in.
It really shouldn't be like that but in my experience it has been. I mean I don't understand why some SA's think they have the right to be snobs.