I'd say its worth approximately one point.
1 point scored + denying your opponent 2 points = 3 points in your favour
Not the same in the Premiership when your opponents will often be fighting in a different battleground
I know you Kiwis are a bit more positive about all things football than us Scots, but this really takes the biscuit!
I'm with you on this one Steve-O, baffled with the Math there.