As far as spec stores and their sales people's attitudes toward sale customers, it depends on the store. Most good spec stores should know that sale customers are a vital part of their business, and become regular price customers and trunk show (Custom/MTM) customers as their income increases. And many customers like myself and I'll wager most of the members of this Forum are both simuiltaneously. We love a good bargain, but if we see something really good that has just the touch of personal style we're looking for, we'll buy it at full price.
Steve's right. Don't be intimidated by the salespeople/pricepoint of the store. If some snooty salesperson (and is it just me, but are the older male salespeople the retail equivalent of a waiter at a Jewish Deli?) condescends to you, ask him very politely to please remove the pickle from his rectum. I did that once at a second tier men's store in NYC masquerading as Bergdorfs, after giving the ignoramus a lesson about the difference between Tom Ford's YSL Rive Gauche and Gucci lines, and the salesman didn't know what to do with himself. I told him that if he wanted to impress me, he ought to at least take a little pride in what he did for a living.