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I've torrented a bunch of things I own. Ripping videos especially can be a waste of time.Sure. But that's like 1% of use cases. Most people download movies they don't own -- to see new stuff without having to buy the DVD or go to the movies. Nobody I know (in several countries) downloads only (or even mainly) movies he owns from torrents.
That's how you get screeners on the most popular torrent lists. I seriously doubt those people own the DVD when it's not even released yet.
So, while you do that, and I sometimes do it (rarely), it's not representative of what is usually done.