DEAR CRABBIT: market the author or the book

Dear Crabbit
We had a brief Twitter exchange this evening. I asked: " Do you recommend focusing on marketing the writer...or the book? "

A bit more info: for the past 2-3 years, I've been blogging. Firstly as a way of promoting my (very) part-time coaching practice (I have a full time day job as well), and latterly as a way of promoting my writing (I've had a small paid writing gig with