Here’s my idea. Viewers don’t know who the Traitors are so you are having to make your own deductions as you go through the episodes like the faithfuls.
Also there is a prize pot for if a faithful wins and if a traitor wins. In the tasks the Traitors have to kind of sabotage (without it being obvious) the tasks and any money available that isn’t banked goes to the Traitor pot.
There’s something that could be done re Traitor recruitment as well as I think there’s a fundamental flaw there that stacks the odds to Traitors but I can’t work it out…