Nobody ever retold a folk epic so they could continue to milk the name recognition value of a licensed or owned IP (like Bay's Transformers movies) or to actually retain the rights to said IP (like the recent X-Men and Spider-Men movies).
But how do you know that's the sole or even primary motive, at least as far as the creative types are concerned?
Somebody offers me a chance to remake Logan's Run or Fantastic Voyage, I am so
there. Not to mention Frankenstein or The Creature from the Black Lagoon or any number of fun old properties that could benefit from a modern facelift. How do you know that the prospect of reinventing, say, Quatermass or Doc Savage isn't enough to get some people's creative juices flowing . . . .
(Says the guy who once wrote the bible for a new version of TOM SWIFT.)
True confession: I can't watch an old movie on TCM without thinking about how I would remake it!