Just because you don't see it in your limited view of the world doesn't mean it doesn't exist. Guess how many One Piece die-hards get off to the manga being the best sold shit of all time. Also movie nerds who jerk off to Box Office numbers all the time. Videogame sites rarely talk about sales of video games unless there are statements by the companies or "analysts".
What is talked about a lot though are sales of the platforms which are important to know for everyone who is invested into video games. Because sales directly relate to how much a certain platform is supported and how much money you should sink into it and how much you should expect out of it.
Your comparison is also wrong. The equivalent to console sales in other media would be the amount of new cinemas built, the amount of investement in new sports stadiums and how well the CD/Blu-ray and digital distribution business is doing. There are no clear and concise numbers for those and they're uninteresting anyway since Music, Movie and Sports entertainment are already deeply established in today's society. You won't hear people in fear of the Movie or Sports industry going down due to sub par sales.
So all in all your perception is wrong due to its limited nature.
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