Here is David Gaughran’s view on cheap ebook pricing.
I definitely think it has it’s place, whether you use it for a new book or keep your first book in your book series permanently on sale, I think those are fine marketing strategies. I would not, however, discount all of my books. I think it does give the impression that the story is not worth it. But then again, I don’t think selling a ebook for over $6 is reasonable, either. They do take money and time to make, of course, but sharing an electronic file is the least inexpensive way to share your stories and the price should reflect that.