Over the past two days if one had bet $1 on every horses at single figures in Don Scott's market and also limited races to a maximum of 10 starters then the results (Unitab divvies) would have been:

Friday
Outlay of $54
Return of $60.80
Profit of $6.80

Saturday
Outlay of $87
Return of $87.30
Profit of $0.30

Overall profit of $7.10 for a POT of 5%

However if they were bet S.P. and assuming a 6.5% take-out, then the results would have been:

Friday - a return of $67.44 from the $54 outlay for a profit of $13.44.
Saturday - a return of $95.45 from the $87 outlay for a profit of $8.45.

Overall POT of $21.89 for a POT of 15%.

I haven't looked at races of 11 or more starters.