Not sure if this is legal, but still a cool ideal nontheless
Is it possible to have an arena that accounts for kills/deaths via crediting/deducting a fixed amount of money from the accounts of the parties involved? So basically, if A shoots down B, then a predetermined amount of money (based on a perk system or something) will be transferred from B's account to A's. Incidental deaths will result in a deduction as well, with the amount be dispersed to say, all the members in the arena at the time.