I'm still trying to find a rhyme or reason for my sales. I try so hard to track what i do each day to try and figure out what boosts the sudden sale surges. I went from averaging 1 a day for months and months even as I pushed and pushed ALL over the internet to now averaging about about 4-5 a day. So that tells me word of mouth and the reviews are helping to pick up the sales. There's no question that promotions like Pixel of Ink help. I jumped from about 50k in my rank to 1300 that day but of course my rank slowly descended. It's never climbed down to 50k but my rank has stayed in the teen k's for about a month now. However I really wish I knew what it is. Yesterday I was so busy editing my wip I hadn't so much as tweeted even once when i checked my sales I'd sold 8 by the end of the day my total was 13. Today I have 1 sale

Don't get me started on B&N I could go weeks without a single sale over there then have 5 sales in one day!
But to be helpful I will share what I did notice helped overall.
My cover When I changed it I did notice not only an increase in sales but an interest in my
blog/fb fanpage. Also before I changed it when I sent out
review requests I'd get maybe a 2% response if any and even that was like WEEKS later. Haven't done so since April but when I sent about 15 requests with the new cover I got about 6 yes responses within days.
Being featured on their blogs once they reviewed it really helped also. I tweeted those reviews and posted them all over.
I probably would not have thought of this on my own. I will be releasing the second in my romance series and a related novella this year. I posted the covers and blurbs on my blog. I even mentioned that the third full length novel will be released sometime next year. I don't have a cover or even title for that one yet. Well an eager fan that loved the first in the series took all the covers including the one with no cover and added it over on
GoodReads as coming soon books. I didn't even know you could do that! I now have people adding them to their "to be read" and "wish list" shelves! Even the one with no title or cover! It's crazy. I've definitely seen an increase in sales since then. So if you're planning on releasing something in the near future you may want to consider adding it as a "coming soon" book over on GoodReads get the buzz going early.
Posting excerpts on my blog and
joining indie groups that
cross promote has also made a big difference. There are many. The ones I belong to are
IAU (Indie Authors Unite) and
IAN (Independent Author Network) Oh and
Stumble Upon brings LOADS of traffic to my blog. As a matter of fact I only joined I believe in March. I've had my blog up since August of last year and it beats out any other traffic source of all time to my blog BY FAR.
Overall I think it's a combination of a lot of hard work and perseverance. The difference in sales from one day to another is what continues to stump me. *sighs* I'll figure it out eventually and when I do I'll be sure to come back and post!
Eli