That's probably because it has a less strong flavor, which you may prefer to the stronger root beers, such as Mug. Baarq's is one I recommend you try if you don't like strong ones, because it has a very light flavor that makes it taste almost just like Coke with a hint of RB.
i do not nor will i ever shop at wal-mart. its just the way i was brought up. my grand father had a bad experience one time at a wal-mart so he told his off-spring not to shop there and my parents have told me it was a bad place. and im sure there is really nothing wrong i would just feel dirty going in one