Just wanted to say that not everyone who works at Apple or Best Buy is simply there for the paycheck. I worked part time at an Apple store for about 9 months because I am passionate about Apple products. I already had a full time job putting in 40-45 hrs/week and often worked another 20 at the Apple store. I always said that I wasn't in sales but in customer service.
Believe it or not, there are some people out there (like me) who believe in customer service. Whether it is buying a $2000 laptop from Apple or a $6 meal from McDonald's, I believe that the salesperson should be courteous and polite and greet you with a smile. Like I said, I've been in the former position (Apple retail), but I'd do the same at McDonald's.
I recently went back to the Apple store I worked at on a visit home. I actually started talking to another customer, and when I said that I used to work at the store, she said that she thought I looked familiar. People remember good experiences just as much as they do bad ones.
To some people, it's just a job. Customer service be damned. But some companies like Chick-Fil-A and Apple (there are others, too) genuinely believe in service and they try to instill those values in their employees. You're right that it doesn't always happen. And a person will always have his/her own motives.