I've never shopped there but I think Carmax's thing is that they are "safe" for people that don't like to deal with car dealers, especially used car dealers. They inspect their cars, offer a warranty on newer ones (iirc) and have the whole 7 day window to change your mind after the deal thing. They aren't going to appeal to bargain shoppers, just to people that want to get a car without all of the hassle.
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