I'm sorry I didn't see your post before - my notifications aren't working very well - I just got an email now to say you had posted. Is that happening to anyone else?
Anyway, it's tough to give advice without knowing what you are doing already to promote your book.
However, you can always break down the key elements, and examine how you are doing.
I think this needs a bit of work. First off, you should remember that must readers will see your cover on listings that are really small, maybe an inch by a half-inch. Shrink your cover down to that size then look at it again.
I'm guessing the first thing you will notice is that your taglines are unreadable. Get rid of them. They are doing nothing for you. The place for them is in your product description.
Now, you are following the basic rules of a good cover. You have a striking image, and clear author name and title. However, I think you could work on the quality of the typeface a little. Take a look at the bestseller charts. Copy the guys at the top. If it's something you can't do yourself, consider hiring a designer.
Covers are the #3 most important factor in a book-buyer's decision (#1 is having read something by the author before, and #2 is trusted recommendation), and it's the only factor under your immediate, direct control.
You don't go into a fight with one hand tied behind your back, give your book the best possible chance by making it look just like a book published by New York. Look at what they do, copy them.
I don't think this is a BAD cover, but I do think it could be a lot more effective with a few simple tweaks.
Your blurb is way too short. It sounds like you have an interesting story but I don't think you are selling it as well as you could.
You should have a paragraph or two that really really makes the reader want to buy it. Again, look at the bestsellers. Find the blurbs you like. Copy them.
There are some good tips on blurb writing here: http://www.publetariat.com/publish/how- ... -your-book
The formatting is fine (I just did a quick scan for errors), but you might want to make "Prologue" a proper chapter heading.
The front matter could be worked on. I would suggest moving the dedication and acknowledgements to the back to give your readers more story. The more story in your sample, and the less pages they have to flick through to get to it, the greater chance they will be drawn in and purchase your book.
I would suggest just one title page (aside from the cover), including the copyright notice, then straight into the prologue. Don't waste any time in trying to hook the reader.
I don't know what you are doing here, so it's hard to advise. Reviews are important. You have some good ones already, so people who do get to read your story are clearly enjoying it.
Submit to some book bloggers. Also, consider posting on sites or forums giving away free review copies.
Do you have a blog? Twitter account? Facebook page? You don't need them all, but you should have at least one of those, and then you can do things like run competitions and giveaways etc.
Overall though, I would say don't sweat it too much. John Locke made $47 in his first six months - your sales are way ahead of average. However, if most of those were to friends and family at the start, and they have just died now, then maybe consider looking at your whole presentation in line with what I said above and just seeing how you can make it better.