I have another idea:
RTB Credits.
Basically these are credits or in-game currency you could get by participating in the community, submitting good add-ons, having your add-ons get downloaded, applauded by the community, and other stuff that you can contribute (like the RTB Wiki). In this way, this currency could be exchanged with some add-ons that are special, in way these add-ons don't just instantly granted for you, you work for them. This maybe somehow stimulate the community to be more cooperative and contribute more. This also encourages teamwork in a way, in which you find very rewarding.
I dunno, it just popped out in one of my thoughts. :D