I think voting should be symmetrical. -- voting have the
same rewards/barriers as ++ votes. Due to the social pressure
of preferring ++ votes over -- votes, the entire node reputation system is meaningless.
Let me make a bold proposal. To counterbalance the social
pressure, making ++ votes should come with a price. Like
losing a positive number of XP. Or a rule that your number
of ++ votes/day could never be more than twice the number
of -- votes, and the other way around as well (with the obvious exception of your first vote).
Abigail