Sequels in general, whether they are movie sequels, game sequels, new albums by the same artists, have never appealed to me that much. For one thing I love innovation, and sequels in anything just means that the first innovative idea has been carried out well enough to deserve a second attempt at it. This means that it's not something new, it's something that the artists, whether it is the director, writer, or developer, have done before, and it's not as interesting.
Given the premise that exploring new grounds is more exciting to you than reliving and rehashing every other similar thing in your life I bring you this scenario. Imagine the first time you're introduced to something new - I'll use a person in this example. When you first meet the person, it's the mystery, it's learning new things about something new that excites you. Apply this logic to mainstream media, discovering a new band/movie/game genre is exciting, but reliving that experience is quite impossible, since it's its ingenuity that was so appealing in the first place. Unless you happen to stumble upon a new genre everyday skilfully executed by the same artists, chances are you'll get bored of it.
So... By exploring new things, I make them stale, and the only way I can satiate my craving for novel ideas is by exploring... See the problem there?