If you're buying secondhand DVD's, and I don't see how you aren't because who's still producing DVD's (or even, who's producing Blurays for older content), then you're on the same level as people who pirate from the eyes of publishers and media conglomerates. You might feel better about yourself, but it's a quirk of history that they haven't been able to make secondhand sales illegal.

You'd be surprised, lots of content is still available as new on places like Amazon, especially if you broaden to outside the US.

Actually, you're entirely right. I don't know why I thought they stopped printing DVDs for new releases.