I totally understand the distinction being made here. An analogy: Do you think Wolfgang Puck is just a cook? If yes, how much of his time would you waste asking him to whip up a 99 cent cheeseburger like the cook around the corner will? I sell a high end service and bristle at those who casually equate me with the commodity-peddlers of the world, too.
I have plenty of experience at both sides of the client/service provider relationship, and both sides have their horror stories in equal number. People who are mostly one or the other are most likely to be offended that the other side does not have them on a pedestal regardless of their behavior. Maybe there should be a companion thread of Vendor nightmare stories; that way clients can share nightmare tales without having their bubble burst as to how exasperated vendors see them, and vice-versa.
I am thinking of an industry forum where threads like "Let's all complain about annoying customers" quickly grow over 100 posts and new ones get started, but "Let's all praise great customers" threads are dead and buried with 5 replies. That is just human nature, BUT I should add that the customers have NO WAY to see these threads! (I hope! :) )