That was the theme of an article I read last week. Blogging will not sell your book at all, wrote a female author, not even if your blog is read by thousands and thousands of people.
This female author had a real, published book for sale and her widely read blog post led to one or two sales of the book and that’s it, she wrote. Yet, she insists that blogging is still a good thing. Blogging gets your writing and your name out into the world and keeps both on your readers’ mind, so when the reader runs across your book someday, they know who you are.
Last year, I read a blurb from a literary agent who said the first thing he does when he gets a submission is Google the prospective author’s name. If they don’t have an online presence in place, he won’t even read the submission.
I guess the lesson to take from both of these tidbits of information is that modern writers better be online in some form.