Some authors have used FB ads to increase their mailing lists, but for actual book sales, I haven't seen anyone who can analyze this. (killzoneblog.com)
I can see why actual books sales would increase as their ebooks are priced to high. (goodereader.com)
Their publishers are really not «publishers,» at least in the sense that they have the infrastructure to create and support a quality book and its author or that they have their internal team — from editing to some semblance of book design and publishing marketing and publicity and that they are accountable in the critical accountability departments of actual book sales and responsibility. (dianetibert.com)