This post by Tim Berry on the dark side of extreme customer service should be widely read and discussed. An excerpt:
The salesperson, meanwhile, notes that the brand is one the store has never carried. She’s dying to say, loud enough for the sympathetic customers around to hear her, “I’m sorry sir, but I know you didn’t buy this jacket here because this store has never carried that brand.” And, after saying that, to send him on his way. “Now please let me attend to customers waiting for my help.” The other customers want that too.
However, because of the lore of extreme customer service, she has to swallow hard, apologize, and process a return. This is bad for her morale, bad for her health, bad for her spirit, and didn’t do much for the store either.