Wal-Mart and price matching

As I was leaving Wal-Mart on Saturday, I ran into a friend who asked me if I knew that Wal-Mart wouldn't match their own prices. Turns out that if they have an item online for less than the same item is in the store, they won't match their own price. Interesting, isn't it? I went to their website and looked at their ad match guarantee.  Sure enough, it says they don't match internet pricing, but you'd think they'd match their own internet prices???? Thoughts, comments?