Hi,
Maybe I wasn't too clear, here it is again if you place $1 on every runner in every race at one track then sum the winners payoffs.

I just did a quick look at yesterdays dog races here are the results as per above;
The Meadows Outlay 94/ Return 68.8
Bulli Outlay 79/ Return 68.4
Gold Coast Outlay 75/ Return 52.4
Angle Park Outlay 62 / Return 45.5
Ballarat Outlay 76 / Return 65

Now do you really think the win payoff will equal monies invested less Take Out.

Which win market is the most efficient. This is your starting point prior to wagering at any track.