On a business perspective,
murdering players will have a large negative impact on overall profits, since you risk the lose of player chars so players are likly to quit after being murdered.
if murders can easily get away with murder (what a lot do) we'll have large scale massacres.
i'd advise jorb and loaftar to keep track of players murder by other players to see if they keep playing or not.
you might have to take the road of making it easier on farm vile players and LP in some cases (IE players does not own black skills player can get 75% LP back on death that can only be spent on green and no combat skills, player owns black skills player gets 0 LP back)