[Martijn]

I have about 24 add-ons in the official repository so maybe I'm not the real person to answer the question

But I bet that you can increase the amount of add-ons in the official repository by adding advantages like a voting system and download statistics.

All advice is welcome. Addon stats will be after my holiday (will ask your help probably).
Ratings is something that needs to be well thought through but is also being discussed on how to work that out.

However what's the reason you have so many and others don't or have their own repo (although that could be useful for lets say beta testing)