[*]PvP Rating can only be gained once from a player who has a PvP Rating of 0. (This prevents players not wanting to participate from being hit hourly for PvP Rating).
The more I think about this, the more I see a need for clarification on this from HCS. There are four possible interpretations here. I'll assume that there are 100 players in my current band (700-799).
1) Each of the other 99 players could gain rating once per reset by hitting me.
2) Each of the other 99 players could gain rating once forever by hitting me. (That is, if player A hits me for rating, they can never hit me for rating again for the life of the game, even in subsequent ladder resets)
3) The first player in my band to hit me gains rating, all others attackers after that gain no rating by hitting me. Once per reset.
4) Same as #3, but once for the life of the game instead of once per reset.
At first I interpreted this as #3, meaning we would need some indicator that a player with 0 rating has already been hit for rating. I suggested that first hit reducing your rating to -1, showing other players that they can't gain rating from you. Then when the ladder resets, everyone goes back to 0.
It seems that others are interpreting this as #1. If so, we need
at least a 75% reduction in XP loss for a 0-rating player, because the volume of hits will be very high, especially at lower levels. We really don't want to drive those players away, and if at level 100 or so I had gotten hit dozens of times per ladder reset, I definitely would have quit.
#2 is interesting; non-PvPers would get a lot of hits all at once, but never again (except gold hits). If this is the interpretation, I would strongly recommend non-PvPers to buy XP lock once right after implementation of this system.
#4 is basically opt-out, but you have to take one hit to achieve that status.