H. P. Lovecraft
With the resurgence of the horror story in the later 20th century, the works of H. P. Lovecraft found a new audience. Not that he really needed a new audience since there were literally millions and millions of Lovecraft enthusiasts.
Of course, there's other people who read his stories and say, "And from this he made a living.
But as Big Jake said, "Not hardly."
And to explain how Howard - as his friends called him - is (now) considered one of the most influential writers of horror stories whose books have sold millions of copies didn't make a living at it, it might be best just to click here.