Because the studios feel the old stories are better than the new and the name recognition will bring people in.

>I've said it before and I'll say it again: Why, with SO MANY good stories around, do they KEEP remaking old movies, just cos the old'n was successful? ("The Four Feathers" has been a major film 7 times so I once read). That ridiculous yarn "King Kong" has been a major release 3 times!