You realise you've just given me free rein to commence some heavy stalking there don't you.
Great read Jd. Wish I was there when those Walmart b*tches started with the 'NO CAMERAS, NO CAMERAs' crap. Opportunity for some top fun there.
As for the moral dilemma, personally I abhor poor customer service and that attitude has helped me save cash through the years, especially with fast food and other restaurants as I wont go back there if treated badly.
I would spend the little bit extra for the friendly service as you want to feel good after buying. Think of it as a 'pleasant experience tax'.
Also f*** Walmart, evil *** bastards.