Poll: What is up with all these DC movies about comics I've never heard of?

They should make movies based on Flash and Wonder Woman. They should be working on the 3rd Batman movie. I've never heard of Constantine or Watcmen until they came out. I've heard of Catwoman but why did they choose to make a movie about her instead of the Flash. Her movie even came out before Batman Begins and Superman returns. And then there's even less popular comics like the Losers and Jonah Hex and Red (which comes out this October). None of the Watchmen are in the DC Encyclopedia (Dorling Kindersly) I have. The Losers are in it but they have different names. I can't find characters from Red in it. There is also more movies like The League of Extraordinary Gentlemen, V for Vendetta, Road to Perdition, Doc Savage, The Spirit, and Stardust. I got these movies from this list: http://www.listal.com/list/dc-comics-film-adaptations. Now I am not a huge DC comics fan. I've probably only read one DC comic book. I am a Marvel fan. But still, I'm sure many people have never heard of some of these comics.