Because its on the rubber,
I think Sniper is right.

But I think people might be wishing a bit
too much also. Bettors and Owners.
The main reason we got 13 horses going
against Pyro is the rubber (and that there
is a possible intention to use this as a training
session before the real event). If this were a dirt
event and Pyro needed the money to get in,
the field would be much shorter of course.
A few would be thrown in because its the last
chance for some of these to get enough earnings.

There would be no other horses I like enough
to go against the best horse in this race. I wish I
had strong feelings about one other as a winner but
I personally do not. Its neat to read the views of others.