Just curious

"[email protected] [ebook-community]" <[email protected]> 13 Mar 2015 17:02:11 -0700

Newsgroups	gmane.culture.literature.ebook-community
Message-ID	<[email protected]>

How does one, if there is such a thing decide if your e-book may do well, or if you should just forget it?   Rule of thumb?  Any way to test it?   Or do you just say too heck with it sink or swim?