Bounty System (PVP)
Create a Bounty System.
It costs X amount of gold (plus a fee [25%]) and a bounty is created for a player. The person who kills the player receives the bounty.
A person with a bounty on them, has a special text or title in their name which clearly states a bounty is on them.
Have a UI in game (or out of game) that lists current player bounties and their rewards.
The bounty should have an expiration date. If a player is not killed before their bounty expires, the initial bounty amount is returned (minus the initial fee, roughly 25%).
I'd want there to be a minimum and also a percentage fee (~25%) for an expired bounty. Example:
Minimum gold required: 250k
I set $2,000,000 Bounty on Player X.
Player goes unfilled after 72 hours of game play. The original bounty cost is given back (via mail) to the person who set it, but with 25% fee. They receive $1,500,000 back.