Average tablet user can't distingwish between good and bad repositories. They're just using what they're suggested by developers. That's why reducing number of private repositories and encourage developers to use Extras is community task.

I've seen quite often suggestions like: 'go to gronmayer, select all repos and install'. There are 59 repositories for Diablo on http://www.gronmayer.com/it/ at the moment. Can you emagine what kind of mess it would be if user installs all of them. And whom user will blame in case of installation problems? Owner of that repository which caused that problem? I really doubt that. Most of users can't even understand this.