Some years ago there was a playwright posting here. I enjoyed his posts, but I don't think he sold many (any?) books. J K Rowling might get away with this, but we can't. People don't go shopping for screenplays.
Maybe you can find his posts, though I think the search engine goes back only a year or two or three.
(Don't trust KDP to publish a print edition. Don't trust CreateSpace to publish an ebook.)