The Dark One
Auror
Lucky me, I love solitude.
That implies that there's a maximum of about 7,000 people worldwide who make a living writing novels. I think the number is probably significantly higher than that.
I did say a decent living. In fact, 7,000 is probably very accurate.
In Australia, I reckon there'd be maybe a hundred writers making a decent living, and Australia is (I think) the 13th biggest economy in the world.
Obviously there're plenty of writers making money (including me) but nowhere near enough to live on.