Good post, Rob. I don't shop at Wal-Mart anymore NOT because they are cruel abusive capitalists or anything like that, but because I know they convince some manufacturers (especially electronics) to make "special" runs of a product just for Wal-Mart with cheaper parts just so they can sell to Wal-Mart for their demanded price. So you may THINK that same LCD screen is a lot cheaper at Wal-Mart, but it could really be a company's cheap knock-off of its own product.
I guess it all boils down to you get what you pay for.