I like the site's intended purpose, but I agree with others that design needs improvement. Also, perhaps you can source some data from public data (i.e annual report, appannie).
thanks for the feedback. It's funny now that you mention AppAnnie I just remembered an old project I did in 2010 called AppsMetrix trying to estimate the number of app downloads based on what data was available (number of ratings, reviews, some apps who communicated about their downloads numbers etc). Somehow I keep coming back to working on the same kind of stuff!