Hmm? AFAIK Target sets prices and shopper experience just a smidgen or two higher than Walmart. Although perhaps there may be some localized differences, I have never known it to be the Whole Foods of big-box general merchandise.
It's probably just because the locals don't want to be seen as "rednecks" for shopping at Walmart. (Of course there are plenty who don't mind, and I guess, better deal for them)