My income per book always reminds me of how tough it is to make at living at this gig, especially for writers who only produce one book per year.
The quote is from paranormal romance writer Lynn Viehl, whose last book was on the mass paperback bestseller list.
The bolding is mine. Because, really, people who ONLY produce one book a year? ONLY? One a year? Wow. Sure, I could probably crank out one rough draft a year, but one finished book? I don’t know about that.
KEN WHEATON 
Actually, halfway through my book in 2 weeks, I think I can see how these prolific writers operate. It is a bit crrraaazzzzy!
These days, I’m lucky if I can READ one book a year.