Hey Alexis, You' ve got good instincts, and The Wife would agree with you about the "relish" thing, although I remain convinced (deludedly, apparently) that I'm just performing a public service. But glad to see you doubting my motives ....
Anyway, the "couple of hundred" figure was given to me by the guy who runs one of the big authors' organizations, so the figure's trustworthy even if I'm not. I can't imagine anymore more quaified to make a decent guesstimate than he.
I said to the guy, How many people in this country make a living from writing books? He said, Do you want to include all kinds of books? I said, No, just bookstore-type books. No textbooks, and let's not include people who write computer-instruction books. And he said, Oh, in the low couple of hundreds.
So yeah, the figure would include sci-fi writers, mystery authors, self-help authors, literary people, etc. The authors of all the stuff at the local Barnes & Noble, minus the computer section.
As I say, one of the surprises of the field is how many even very big names can't and don't get by on what they make from their books.
Can anyone think of a similar industry -- where the people who produce the product don't generally make a living doing so? I can't, but maybe I'm overlooking something obvious...