I really can't imagine why. Law of averages maybe? I mean there are thousands of Walmarts. How many times a week does the average person go to walmart? I used to go 2 or 3 times at least. How many times did I post a positive review? ..... Well never lol. Going to Walmart has become so much a part of our daily routine that we don't even think about it, but let one bad thing happen and the average person is going to talk about it on FB or post a bad review. So I think that's probably the reason.