I would like to refer you to a little company called Ceton. Don't worry I never heard of them before 2010. As far as I know they never made a mass market consumer product before then.
I read
an article in late 2010 about people spending $399 a pop on a cable tuner card to use with Windows Media Center. You read that right. They were spending as much as the cost of an Xbox One (minus Kinect) on a 4 tuner PCI card so they could leverage the full power of Windows Media Center. The company couldn't keep up with orders. Eventually other people jumped into the market.
I don't know the true current size of the Windows Media Center market but it is pretty shocking that less than four years ago people were lining up to pay $399 for the Cadillac of tuner cards to work with WMC. Honestly between sharing netflix and Hulu with a friend and my WMC setup I pay next to nothing for my video entertainment.
By the way that 4 tuner card that sold for $399 in late 2010 is now $250 and has six tuners. So six dvrs all recording at once to an unlimited amount of HDD space that is user expandable. If apple had something like this it would be on the cover of TIME magazine.