I started writing it years ago just for myself.  I had in mind having a quick reference style book that would fit in my ruck and not weigh a ton and did not want to keep the POS aviator binder I toted around for years in the army.  I never intended on publishing it at all.  I first started thinking about publishing it last year and was rejected by two different publishers before I decided to self-publish.  Self-publication over Createspace is ridiculously easy.  I am not doing it for the money.  I hope the book is worthwhile and judging by the reviews I have gotten, the prepper community likes it, or they are all blowing smoke for free content on their sites.I have noticed that a slight uptick in sales happens after a review goes live.  I make enough per copy to keep me writing the revised edition and I plan on putting hat out next year sometime, probably late spring.  I could not make a living off of the sales though.  I make about $5 per hardcopy and a little more per eBook.  Of course, if you buy a book like this as an e-copy you are a moron and whatever is in the book won't help you for the time period it is designed for because you will probably be dead.