Brandeezy
Superstar
Do ratings even really matter anymore? I mean we live in a time where ever critically acclaimed show has very pedestrian ratings, people just don't watch tv like they used to and that's why so many people have backed up DVRs.
This article explains it, it's a mix of cost and viewership. It's why most Netflix shows stop after 2 or 3 seasons.
Why Netflix Cancels Shows Quickly & Why Can’t They Find New Homes – Deadline
As an asset, having 30 episodes of a series (three seasons) is considered enough to satisfy viewers discovering the show. Tacking on more episodes does not add significant value, I hear. “A show doesn’t serve a purpose [anymore],” an observer said. “There is no reason for the network to continue to invest in it.”
Analysts believe that 5 seasons are the most you're gonna get out of a show in this era of TV