Doomben: 3,14 - 10,7 - 3,7 - Field =$128 - PENDING
Randwick: 4 -1,3 - 10,14 - Field = $56 = WON $43 (after commission)
Caulfield : 1 - 3 - 7 - Field = $11 = WON $46 (after commission)
Gold Coast: 3 - 5 - 5 - Field = $14 = WON $46 (after commission)
Newcastle: 1 - 1,10 - 10 - Field = $22 = WON $45 (after commission)
Bendigo: 1,2 - 2 - 5 - Field : $26 = WON $35 (after commission)(see worked example below)
Morphettville : 1 - 5 - 6,1 - Field : $28 = WON $45 (after commission)
Ascot : 2,4 -9,13-14-Field : $56 - PENDING

Now for Bendigo the first leg won.

So we layed 1 and 2 in the first leg and 2 won. The odds were:
Number 1 :$8.00
Number 2 :$4.70

We layed 37% of $76 = $28 on Number 1 and it did not win.
We layed 63% of $76 = $48 on Number 2 and it won.

So our loss on the first leg was $48*4.7-78 = $150

So then we waited for Leg 2 of the quaddie.
We now need $150 + $50 +26 = $226

In the second leg I layed Number 2 at odds of $5.60. It lost. So I made $35 after commission ($226*0.935-26-150)

Now if Number 2 had won then I would have been laying 5.60*226 = $1265
In Leg 3 I had number 5 which would have cost me $8.20. This is the bit where Shaun was talking about. The numbers can and do escalate quickly. If we had got to this point then we need to alter what we are doing in leg 3. The quaddie for this meeting only had $4623 in the pool. So there is no use trying to lay to a liability of 8.2*1265 = $10373.

This is the issue with this method.