It's not way cheaper long-term at all, I mean unless you really watch/listen to a tiny amount of content, you can rip the same way with Netflix, Hulu and so-on as well so I don't see how that makes it more durable?

What you are doing is practically the same equivalent as downloading torrents, how do you have "more guarantees" than just downloading?

PS: I'm saying this because what you are doing is already illegal so there is virtually no difference.

If you buy the DVD and rip it to make it easier to watch / as a backup, it might be legal in your jurisdiction.