I agree Shared Slaughter could be fun, I think the problem is determining VP/SS when killing models especially when certain masters can start the game off by reducing the amount of SS the opponent can kill right off the bat.
Well when regarding Masters it could be written in that their wounds dont count: since you dont pay for them anyways correct? But you would get 1VP for killing a master.
SS cost does not always equal power level. this is true across this and many other games.