This is what you get if you contribute something to R2DA.
Model - Gets Credit and Maybe a Special Weapon? (If they play)
Skin - Custom Effect on that skin for the weapons they did. Like a Burning Retro?
Gun - Get maybe a Special Weapon?
Map - Special Permanent Flag, or health Increase?
Item - Infinite of that Item?
R2DA Itself - EVERYTHING
Event Boss - That Said Event Weapon and Mount
That can be used to pay someone for their good deeds. Because right now, you don't get anything but just get it in the game. Like for skins, you don't get payed back with anything.