I like the idea. When I worked at appbackr we thought about something similar.

It would be cool when there is a little more data in the about the performance of the app. I think of it like a dribble for app developers that keeps itself up to date. As we're programmers we don't want to maintain it :)

You should talk to my friends from appmonsta. They have a lot of data around apps. Maybe you can work something out.