Providing another tidbit here for those who keep failing at making a profit.

Lay Barier 1 if it starts at or under $3 or less

In the last year there have been 402 selections for a profit of 19.17 after commission of 5%.

This works because:

1) Betfair prices mirror tab prices to a certain degree.
2) Ordinary tab punters bet too much on barrier 1
3) Causing the horse in barrier to be overbet.

Simple logic.

There are heaps of examples of 1 thing that causes people to overbet providing good laying opportunities. I am sure most of you can work out what they are. I suggest the above as a starting point for a laying system as you can increase the profit substanitally with a few good ideas.