You should read the rules. Every four years, new policies are introduced. Nothing happens to the ones you already have. That would make no sense and destroy any semblance of legitimate strategy by completely removing any kind of long-term prospects.
As an update to my earlier suggestion about mixing positive and negative policies, I was thinking that there could be even more options made available to further vary the gameplay. One thought was that perhaps everyone could be randomly chosen as "A" or "B" at the start of the game (with no one knowing which they are, or how many of either there are). For the entire duration of the game, all people in group "B" will have the +/- policies they receive inverted (so if all "A" players get three + policies, all "B" players get three - policies; if all "A" players get +2, +4, -4, then all "B" players get -2, -4, +4).
Things should still be even since you can both gain and lose points from a positive or negative policy. The only way the differing number of positive/negative policies should be imbalanced is if the total number of any player's positive policies is not equal to either the total number of another player's positive policies or that other player's negative policies.
For example:
There are three players. Their policies are as follows:
Player 1: +2, +2, +4, +4, +4, -4
Player 2: +2, +2, +4, +4, +4, -4
Player 3: -2, -2, -4, -4, -4, +4
These three players would be balanced, because they each have the same capability to gain/lose the same number of points on any given bill.
They would continue to be balanced as long as, for the entire duration of the game, Player 1 and 2 always received the same numerical values for new policies, and Player 3 always received those numerical values inverted for new policies.
Example: It would no longer be balanced if, say, three new policies were added that were negative for everyone.
Player 1: +2, +2, +4, +4, +4, -4,
-2, -4, -4Player 2: +2, +2, +4, +4, +4, -4,
-2, -4, -4Player 3: -2, -2, -4, -4, -4, +4,
-2, -4, -4This is no longer fair, with Player 3 being at a significant disadvantage because he does not have the potential to gain as many points from any single bill.
However, he also does not have the ability to lose as many points, so perhaps giving players an option to desync themselves from the other players for this sort of trade-off would be possible? That would likely complicate game balance quite a bit though, whereas this suggestion of simply having one group of players with inverted numerical values for the entire game is fairly straightforward.
Something to consider, anyways. Since players could pretend to be in the opposite group from the one they're actually in, I think it'd diversify gameplay a bit more, which seems to be something you're looking to accomplish. You'd just have to consider whether or not policies could still receive a balanced distribution.
However, you don't need to change much. Your game mechanics are already pretty solid, drastic changes aren't necessary.
Edit: This may be one of those instances where you don't have a very good perspective on the gameplay because you're the host instead of a player. I would actually be interested in hosting this in the future, with basically no modifications to your current ruleset, if any. I would advise you to try playing it before significantly changing the core gameplay.
Post has been edited 2 time(s), last time on Jan 5 2012, 9:50 pm by Azrael.Wrath.