My sales are really good for me - each month better than the last - I already have 17 sales and still have 2 more weeks til the end of the month. I try to list something everyday - at least one thing. I also am constantly tweeking titles, descriptions, tags, and even prices. I'm thinking that title & tag adjustments coupled with the new listings help to keep my shop at the top? I may not know what I'm talking about, but it seems to be working for me.