In Infected Wars a human gets 1 gc for killing a zombie and a zombie gets 3 gc for killing a human. A good player will get, on average, about 30 zombie kills and 2 human kills in a round, totalling up to about 36. Rounds often take around 8 minutes on average. Do something similar in minecraft. GC for killing someone depending on their equipment value. Simply give a value to their best sword in their inventory, best bow in their inventory, and then their equipped armour. Then translate that into a GC value which will then be given to the person who got the kill. So not only do players receive over powered loot, but they can further boost their abilities by buying the better perks? At this point as Corby said the only viable options are voting or manually handled transactions. We could tie it to XP, but if we put that into place we'd need measures against things like the end spawner. No no no, silly! Maybe I didn't explain myself properly. The killer will receive the GC! A person must kill someone and the victim's GC is transferred to the killer! Sorry for not explaining it well enough. But then people that have actually done us a favour and donated are getting raped out of their coins all for some little twerp that has no clue what a green coin is to log off and never play again.