Affiliate Marketing Secrets

I am having terrible trouble selling my ebook Celebrity Ghost Stories. I have done everything to promote it: put it on the front page of my true ghost stories site (which gets over 1000 new visitors every day!), mentioned it in relevant blogs and forums, promoted it on Myebook.com. Yet despite all this, I haven’t sold one single copy/1
Could it be that the paranormal ebook business is not a very profitable one? Should I pick another niche?
Huh, so much for all those who say that selling ebooks is a lucrative business!

Admittedly I’ve no experience in business at all, but the idea of having your own business – being your own boss – sounds an appealing one. How do you come up with a decent idea, though? Is it all about looking for a niche market or doing something established already? Are there any surefire prospects or is it all hit and miss? Anything worth trying?
Thanks.