Short fields are a very big problem. Whenever a field is large, there is also a very good chance that there will be a few horses in the race that literally have a low single digit chance of winning. Yet they are sometimes only 10-1 or 15-1 and used heavily in the exotics because people hit the "ALL" button. That eats up a lot of the take. Remove them, and it gets really difficult to find value among the remainder.
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