I was searching in the iTunes Store, and noticed that you can "buy Now" content. This makes sense with music, but why movies ? For example, I was renting this movie "Mission Impossible: Ghost Protocol" yesterday, and then went to the Trailers section and found "The Grey" I know you can't rent this movie yet, as these exist in trailers, but why can you "buy" them ? Buying, suggests their on the iTunes store, and if their on the Store, when why not rent ? I thought that was the model (even as an option).