Watching the Book in Sales Rankings / A Great Review!

I'm learning a lot about the world of publishing, like if you self-publish in a "print-on-demand" manner, as it is with my book "Ghosts and Spirits: Insights from a Medium," if you do book signings, you either have to buy them from the publisher and sell them in a store on consignment, or have the store buy them, and you buy up the unsold copies.
Meanwhile, the publisher's website (Virtualbookworm.com) is selling the book (I HIGHLY recommend them!); as is BarnesandNoble.com and Amazon.com among many others.
I checked the sales rank on the book (although I won't know how well the book is financially selling until 90 days after a given month) on Barnes and Noble.com and Amazon.com. Here are those standings today:
1) BarnesandNoble.com Sales Rank: 92,581 (out of how many, I don't know)
http://search.barnesandnoble.com/booksearch/isbninquiry.asp?box=9781602645134%20&pos=-1&EAN=9781602645134
2) Amazon.com Sales Rank: #68,890 in Books (See Bestsellers in Books) ***WHAT IS INTERESTING? Yesterday, it ranked somewhere like 386,400 on Amazon!***
Popular in this category: Books > Religion & Spirituality > Occult > Supernatural, it ranks #30!! (THIS IS UNBELIEVABLE TO ME!)
http://www.amazon.com/Ghosts-Spirits-Insights-Rob-Gutro/dp/1602645132/ref=sr_1_1?ie=UTF8&qid=1262792014&sr=8-1

A GREAT REVIEW! - If you buy a book on Amazon.com or BarnesandNoble.com, you can write a review. The first (and only) review on Amazon so far choked me up!
Here it is:
By Samantha Realynn Deshong "wolf maiden" (Pennsylvania)
Amazon Verified Purchase
I've read plenty of books dealing with spirits, ghosts and the like while experimenting and exploring my own gifts. I have to say that none of them ever really delved into the detail and personal level that this books does. It offers a more distinctual look at the supernatural elements around us and how they work. The scientific aspect of it was insightful and answered a lot of questions that I had that other books could not. I give this one 5 stars! A must-read for budding mediums and other psychics, or even if you just want a good source of info about the supernatural!