Well, by that logic, there's no reason to have more than one grocery store per neighborhood, but we have Safeway, Lucky, etc; or more than one car dealership, but we have Ford, GM, Toyota, etc - private enterprise and competition; availability, etc. If I'm making a series like West Wing, I am gonna want to have access to the set pretty much continuously so if some rival show wants to film a similar scene, they'll build their own.
Well, by that logic, there's no reason to have more than one grocery store per neighborhood, but we have Safeway, Lucky, etc; or more than one car dealership, but we have Ford, GM, Toyota, etc - private enterprise and competition; availability, etc. If I'm making a series like West Wing, I am gonna want to have access to the set pretty much continuously so if some rival show wants to film a similar scene, they'll build their own.
Here's a 2014 article on Quora (which sucks as a site, but fulfills the need here) https://www.quora.com/Does-each-movie-that-needs-to-shoot-a-scene-in-the-Oval-Office-build-its-own-set-or-is-there-a-replica-of-the-White-House-somewhere-in-Hollywood-that-all-the-productions-can-rent
350 million people need food every day. 2 people need a Whitehouse movie set once every year or 2.... come on now.