Simple..majority rules.
Each round, you all vote, contestant with most votes is evicted.
Immunity, you each have one immunity pass, which you may use whenever.
You may only use it once. To use immunity, include the word IMMUNITY in your vote PM. Only first PMs count...you cannot change votes, or say IMMUNITY after voting.

Failure to vote = Elimination

NEW TWIST: One of you has been selected at random to have a special power in this game, one you can cancel someone elses vote, and have their own vote count for double. The further in the game this person gets, the more powerful they become. Each round they stay in the game, 1T$ is knocked off the prize fund, which starts at 10T$.