There are some interesting variations of the game, using a standard Monopoly set. One I've seen allowed things like Lynch Mobs - if enough of the players agree, they can send someone to prison, remove their assets, or even eject them from the game. You could also institute a rule like "90% tax on cash holdings" or "those with assets under $200 receive an extra $1000 when they pass Go". It sort of combined Werewolf with Monopoly, because it required more skill at the human level to persuade your fellow players to vote with you.