Leaked documents seen by Reuters reveal how Amazon Prime Video drew five million new members to the platform by 2017.
The documents show Amazon's total US audience for all video programming on Prime (which includes the shows it licenses from other companies) was 26 million customers. Unfortunately, we do not know the figures for its global audience.
The first season of The Man in the High Castle drew in eight million US viewers early in 2017. The show cost $72 million to make, and attracted 1.15 million new subscribers worldwide according to Amazon's calculations. This means that the show brought in Prime members at an average cost of $63 per subscriber.
It's unclear how Amazon works out a customer's motivation for joining Prime, but according to Reuters a "person familiar with [Amazon's] strategy" said the company "credits a specific show for luring someone to start or extend a Prime subscription if that program is the first one a customer streams after signing up".
That metric is called a 'first stream', and is used to calculate how expensive the viewer was to acquire by dividing the show’s costs by the number of first streams it had. The lower the figure, the more profitable the show was.
