What do you think the businessmen that determine negotiations are looking at?
many metrics
ratings/box office, of course, but also:
the performer in question's quote is a good starting point, but also how that quote is trending is useful as well, can't let the competition outbid you after all
social media mentions
live ticket sale trends/venues
demographic data - if your stand-up content is primarily being watched by males, having more female representation could attract a different, more female demo to the content, more subs, more $, it's elementary
their own internal lineup -- if they have users that love to watch stand-up, and there's no new stand-up scheduled, they might lose users, just having that extra line on a list of upcoming projects adds huge perceived value to the subscription, even if the users aren't interested in that particular project, it instills confidence that the service is heavily investing in original content, validating your $10 even further, and making you feel smart for getting so much for it
subscriber data is also a huge resource for Netflix, each show has its own internal data that Netflix programs algorithms with
many of those algorithms can be used to predict what sort of content large portions of users/potential users might be interested in viewing/subbing for
basic cost/benefit analysis