is it true that most indie developers have around 2-3 sales a day on the windows phone store

[WPCentral Question]

i read some dozen replies and it seems that the average is about 4 apps a day but this is 'skewed' due to the fact that a an app or so was making like 20/day - however i need more data to get "average" sales per developer. it was also about 2d games and just 2 utility/non-gaming apps. thanks in advance if someone has some figures will be great!