Right or wrong here's the answer,but read it at your own peril.

I copied the prices down at Sportodds for the line bets.
You will notice they are very similar for each game.
That being $1.90 corresponding to the margin Sportodds thinks is what the margin will be.
And slowly increasing or decreasing in set amounts per point variance from said margin.
I use my copied chart to calculate what my early Multi will be,prior to the actual roll-your-owns being advertised.
Mo is my name.Mathematics is my game.