Are you marketing your app? If so, what are you doing to get your sales off the ground? Write a press release? Twitter about it? Buy ad-impressions? Blog?
The list of possible things you could and can do to increase your sales performance is long but still appears somehow narrow.
No matter what you decide to do, one thing we know for sure is the big impact being listed in the overall and category rankings of the App Store can have on sales. This effect starts kicking in once you have entered the Top 100 of the respective list, as overall visibility and accessibility of your product increases. Of course, the higher you rise in the top lists, the more visibility and sales you gain.
So in our opinion it is of utmost importance for you to know not only when you have entered the top 100, but also how far you are away from entering it. Having an app ranked 105 or 405 makes a big difference in terms of how active you should get to increase your app sales – even if just for a day or two.