The sprites of website navigation smiled kindly on me and I determined why Summer Horse sold so many copies yesterday. It's #15 on the bestseller list for kids 9-12 at B&N.
Since I don't know how or why that happened, I can't tell you or me how to make it happen with any other book. Give it the best cover and the best description you can.
I can tell you things I didn't do. It wasn't reviewed (there's a site for reviewing ebook kiddie lit???). I posted announcements months ago at the Kindle Forum and Nookboards. I think between the 2 maybe 10 people looked at the post. (Ditto for Dream House, a total bore). I didn't go around like a maniac talking it up. I didn't have a link in my sig pointing everyone to it. In other words, I did nothing to help it. I was too busy and the whole scrambling around the net doing something I find distasteful is a snooze to me.
I find it annoying for writers to keep clobbering people/potential readers over the head with their desperate attempts at drumming up readership. I am so wrong as proven by Konrath's sales as well as Karen McQuestion's and others. This is the proven way to success. But it's not in my personality. So I don't do it.