It's a model that has worked in the past for some people, including this recent example I heard about on NPR: http://www.sciencefriday.com/segment/02/14/2014/andy-weir-th...
He slowly published each chapter, then when he finally finished the book, he posted the ebook versions for free on his site. Eventually he added it to Amazon (and had to attach a price to it because they don't let you give away ebooks) to help people load the ebook onto their Kindle with less friction than making them download and transfer the file, he found that he was selling more copies of the book than he was giving away for free on his site.
It's exactly that model of openly sharing what you are working on with the people that are going to use or be entertained by it that we want Softcover to encourage.