All is very logical, unfortunately ! Like the article was saying : "the relatively anemic launch line-up of both the Xbox One and the PS4" : then the most surprising was to learn that "each console moved a million units in a single day, and 3-4 million since" !
And more : when you know how the first models of consoles tends to "wreck" pretty easily..
But video games shops are often on the brink of disparearence, alas...