I am not that sure tbh but everybody that buys the e-book will have an interest in making and saving money and will no doubt be members of like minded sites and forums which can only help with people hopefully talking about it thus getting more people on board.
Im not really sure which route to market you want to take, but I've written and published four of my own eBooks. I use Office Org 3.2 to write the manual and then convert it to a PDF using Adobe. If you have a site then, you can set up a payment gateway using Clickbank or Paydotcom for a small fee (this directs the buyer to a secret page once they've purchased your product and they can download the attachment immediately) and then get other marketers to promote your product for a fixed commission.
Now have a Son in Law, and have become the 'dreaded' Mother in Law. Many congratulations to Hazel and Matt who got married on 10th August, at the Centre for Alternative Technology, Machynlleth, North Wales. It was a fab weekend away and the most unconventional but personal wedding ever!