This idea is inspired by Borderlands 2. Maybe we could add in super bosses that cost tokens to fight and if you win you get a large sum of tokens or special gear that that mob drops. An example of this would be an arena with a lever next to the door with a Slimezilla as the super boss and when you flip it, it costs you 3,000 tokens and if you win the fight you get 10,000 tokens along with a custom item. Let me know if you all agree with this.
I kinda like this but would twist the idea around a bit.. All "items" dropped from mobs would be only available in this mob killing game.. Imagine starting out killing zombies and they drop leather armor and as the mobs advance in skill the better the drops which helps you advance in your mob killing quest until your able to defeat the very last king mob for that big token payout.. (all items acquired stay on games server in this new mob kill quest.)