[3kings]

Here is my quick shot at this:

Race 3. 6,7
Race 4 2,6,12
Race 5 1,5
Race 6 2,6,9
Race 7 1,3,5,6
Race 8 3,6 (Would use the 16 if I thought he would start, won't be able to update)

Total: $576.

Good Luck everyone!