I respectfully disagree with this generalization, particularly the portion I bolded. There are many factors which consumers use to make a purchase decision - product quality, price, brand, convenience, etc. - and customer service is only one of them. As for expecting "service after the sale", I believe that the trend towards retailers that offer lower cost but lower customer service (Wal-Mart is the extreme, but most of the big box stores qualify) and away from smaller shops that offer personal service at higher prices shows that the opposite is true. I know that personally I'd rather do the research, make my decision then buy the product at the lowest price; if the product functions, there's no need for "service after the sale" - I don't want someone calling me trying to sell me more....
As for "The Customer is always right", sorry, wrong answer. As both a small business owner (software) and a customer, I've experienced more than enough situations where the customer was definitely in the wrong. Have I made attempts to accomodate them? Yes - but they weren't "right".
To me, the sad truth is that the days of CMs going the extra mile - as the rule, not the exception - are as much a part of yesterday as guests who were courteous in their requests and realistic in their expectations. All over the DIS, and allearsnet, and r.a.d.p you can find examples of how to work the system to get every last drop you're entitled too - and a lot that you're not. With this mentality, I'm not surprised that Disney CMs respond by only giving the bare minimum - and less.
IMHO - YMMV