Season 4 of Netflix’s House of Cards dropped yesterday, and while Netflix notoriously doesn’t release viewership numbers, Mark Fahey at CNBC makes an educated guess that about 5 million people will watch at least the first episode within the next 30 days.
Fahey extrapolates from a few of the data points we do have about Netflix (NFLX)—some from the company, some from surveys or other secondary sources. In the fourth quarter of last year, the service was just short of hitting 75 million subscribers, which is estimated to have since grown by as much as 7 million. According to a third-party survey, about 6.5% of Netflix subscribers watched at least one episode of Season 3 of “House of Cards” within 30 days, leading to Fahey’s 5 million-viewer estimate for the new season.
Get Data Sheet, Fortune’s technology newsletter.
- Republican Presidential Debate (Fox News)—16.8 Million
- Grey’s Anatomy (ABC)—7.67 Million
- The Family (ABC)—5.74 Million
- WWE Smackdown (USA)—2.5 Million
- Vikings (History Channel)—1.9 Million
The Family is a particularly notable comparison here. It’s a debut drama, with little to none of the kind of social media buzz surrounding House of Cards—and its 5.75 million broadcast viewers was considered fairly mediocre by industry watchers.
For more on Netflix, watch our video:
This isn’t an apples-to-apples comparison, though, since Netflix’s subscription model is fundamentally different from conventional TV’s advertising foundation. As media researcher Jason Mittell pointed out in The Atlantic last month, Netflix subscribers are buying “the brand itself,” driven by opaque critical and social buzz. Cable and broadcast networks, by contrast, rely on hard numbers to sell a totally different product—viewers’ eyeballs.
The surprising conclusion? Netflix subscribers don’t actually have to watch House of Cards for the company to make money from it. It’s much more important that viewers and the media (like, say, Fortune) spend a lot of time talking about it.