Netflix would prefer you do this, too. In subscription models, you are almost guaranteed to be paying more than you're using. Only when a service is first starting and trying to attract subscribers is it likely you are paying less than you use.
A non-subscription model for a Netflix service would be closer to fractions of a penny per view.
Everything Netflix talks about is getting users to spend more time watching shows, not less. They certainly want subscriptions because they make more money, but they do it by aggregating a ton of content into one subscription and providing it at effectively no variable delivery cost. The result is that users pay less per hour watched than can be provided by anyone a la carte.
Their adherence to a subscription modivates the view of getting users on the platform for as long as possible, regardless of what they're watching. A pay per view model would twist motivations another way.