Why these books doesn't exist is something I cannot understand... I know that in the 1990's, all the DC Batman movies got a comic book adaptation, (damn, even Catwoman got a comic book adaptation!) and I loved these! They don't add much to the story, but it's fun to rediscover the movie in an illustrated form.
Marvel publish the "Prelude" tie-ins before each MCU movie, but why don't they also adapt the movies themselves in comic book form? Not sure if it could appeal to many here, but I think it would sell well. Anyway, personally, I would be very interested in buying more Earth-199999 comics!