GeneralGym,

I believe there may be a way to profit from this apparent anomaly. Betting trifectas, include runners in your selections which qualify as "orphans."
That is, we refer to the paper journalists polls available in most city publications(or we could also include radio and television tipsters).
We look for the horse which is only selected once by the scribes. That is, it appears once in the consensus polls of all pollsters. It doesn't matter whether the pollster has selected it to win, run second or third.
Include this runner with your own selections, even if it has poor recent form as it is surprising how often they win or place at generous odds thereby returning a worthwhile div.
Look forward to your comments.

Cheers.