If I remember rightly alien was an expensive video to own and any other films which was why we had so many hire shops.
I don’t think thats anything specific to Alien. When home video players were launched movies werent initially licensed for private ownership. At the time it came Aliens came out there weren’t really any movies sold for home ownership The tapes the hire shops had were on a different license and cost a lot because the cassette was effectively a license permitted them hire the movie studio’s IP for profit, Tapes marketed for home ownership came later, and are a different kind of license (you don’t ‘own’ a movie if you buy it on physical media, you’re buying a license to view it and the tape/disk is just the media that allows you to use that license) at a lower price but they were a different ‘package’ and price and license to the ones rental stores had. A video rental store would be prohibited from renting out retail copies.
What actually caused that shift was kids – movies were only originally supplied on a rental basis becuase it was assumed people wouldn’t buy a copy of a movie that they’d only want to watch once. What drove home sales was the realisation that kids would happily watch the same film over and over and it was Disney that lead the move to sell direct to the public.