When you gift something on the hive get something back.
There would be a menu for gifting like what we already have, but it would show how many gifts you had sent of each variety (costume, pet, etc.) and every 5 or so gifts (of one type of gift) you would unlock a special cosmetic. The more you gifted things, the better the cosmetic it could be. It might start with a hub title, or an avatar. Then once you hit the 10 gifted mark you might get a hat or a costume, and so on.
This would benefit the hive and make much more money for the server if gifting would give you exclusive cosmetics.