Thanks, U.B. This would apply to races of 11 starters (I've reduced the max amount of starters from 12 to 11). However, I think the profit might be more attractive from betting because after looking at Saturday's results there have been some races whose profit have trebled the race's outlay. However it's something to keep in mind. My only perceived problem is that I've got to be at a computer.

Also, thanks everyone for the info re the turnover tax.

Assuming a turnover tax of 1.5% ($1.50 for every $100 wagered) yesterday's outlay would have been approximately $149.50 for a total return (includes Betfair's commission) of approx $183.

And on Saturday the total outlay (I've also included the T.tax of 1.5%) comes to approx $212 but the total return comes to approximately of $307. There were 39 races, and the winner was struck in 38 of them. I think betting was better than laying, but that is after only 61 races over the two days.

I'm ending my research with this. I'm tempted to bet qualifying races when I'm at a computer.