Personally, I don't consider getting something off iTunes as "owning" it's more like "buying the rights to watch/listen" Especially since everything on there is such poor quality. I have two songs I bought, and they were 192kbps! Can't deal with that kind of quality for my music..
I saw a rumor that TF: Prime will be getting a Blu-ray release. I sure hope so. I look forward to buying this show! I download all of my TV to watch, but the shows I really like, I will buy physical copies, preferably on Blu-ray if possible