The 100ptrs
If also one of RadioTAB selections

1st 33%SR -15% LOT

2nd 25%SR -13% LOT

3rd 20%SR -17% LOT

Average if in top 3 selections 25%SR -15% LOT

UniTAB prices.

So if using Betfair prices, for an approx 15% greater, which is accounting for commission.
One should approx break even if using Betfair.

That's not a bad starting point, just eliminate 1 selection from 8 races & your in profit by approx +12.5% POT.
Using Betfair prices.
Or
Successfully lay 1 in 8 races & your miles in front.

Apparently I was reading somewhere that Backing all the 100ptr $20+ shots, shows a profit.

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Cheers.