https://games.yahoo.com/news/sounds-xbox-one-sales-reached-171500121.html?.tsrc=yahoo
Over 5 Million Xbox One users used a particular app. That means there are far more than 5 Million Xbox One owners. OR maybe people are paying two Xbox One Live subscriptions on their systems (highly unlikely).
5 Million Xbox One owners have wifi AND have used the app. Lets assume 5% of Xbox One owners do not have wifi and 10% have never touched the app.
I think Xbox One sales are more like 5,750,000. I think Xbox One is undertacked in oither regions like PS4 was. After all, Xbox One did ship 5.5 million a few months ago so its natural tio assume that sales should be higher than 5.5 especially after a price cut.