Of course, the point isn't that you should raise prices. The point is that you can charge more--and people will actually pay it--if your book is good. Well-written, well-edited. All the marketing and publicity in the world can't help a weak book long term.
I so agree. While I am slow on sales, even after a year and a half, I really haven't marketed much either. I've been working on writing, writing and yes writing. I have three books out and two more in the works. It's slow going so far but I am one of those people who look, listen, learn and keep trying. Nothing in life is ever free and if you want success you have to work to achieve it.