I also don't mind paying for content but i want the content as it was originally broadcast. With streaming if you "buy" something they might eventually replace the background music or cut scenes that are deemed insensitive or clash with the director's new vision. Or they decide you need to view 4:3 content with the top and bottom cut off in 16:9. Or in some cases you might lose access to the content entirely because the license expired.
Or they discontinue the app and roll your purchases into some different app with a horrible interface (youtube music).