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I think fiction authors who make their living doing just*that are relatively rare. Vonnegut's estimate may not be far off.
*By that I mean: they don't blog and/or drive revenue through advertising on their website; they don't sidelight as a screenwriter, editor, journalist, etc; they don't teach; they don't do writer's workshops, conferences, lectures; basically, anything other than the primary stream of being paid to write their fiction.
Most working writers have to be fairly diversified in their writing unless/until they can find a strong following in a niche that will let them pick & choose their projects.
I think very few authors are at the "pick & choose" level.
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