I think the player who gets the last kill in a gang war should get five diamonds or 5 million cash. The one who gets the last kill can pick which one they want but can only win it once a day. And they can still collect their cut from the money looted.
Doubt they'll do the diamonds, but yeah, i like this idea. Have a bit of competition to get the last kill. Make it more appealing to all the billionaires in the game, have the cash amount b linked to ur opponents respect level