Well, there’s Branaugh’s Henry V and Much Ado About Nothing, which I thought were pretty good. Some people seem to like Romeo + Juliet, but I haven’t seen it. And there was Titus and Prospero’s Books a while back. Not to mention two or three different versions of Hamlet.
The problem isn’t why no Marlowe movies recently – it’s why so few public performances or movies of most Shakespeare contemporarties (or almost so) ever. It’s not just Marlowe – what about Ben Jonson? Or Beaumont and Fletcher? Seen any movies about The Alchemist or Tamerlane?
For some reason Shakespeare got a lot of adulation back in the 17th and 18th centuries that carried over to today (George Bernard Shaw called it “Bardolatry”, and it clearly pissed him off. He even wrote a Punch-and-Judy-esque puppet show “Shaw vs. Shav.”, in which the puppet representing Shaw himself gets to beat the stuffing out of old Bill.) I’ve read precious few of the works I note above, and I thinmk I’ve only seen one of their plays on stage.
If you want to see more Marlowe plays or movies, write your local theaterr company, or campaign for it with the film companies. Just figure out a way to convince them that they can make money off a movie with people speaking 16th century English. But nothing’s impossible, especially in a world in which they actually made a movie starring Shatner in which everyone spoke Esperanto.