Take a look at the Cobram Harness Facebook page Kev
https://www.facebook.com/CobramHarnessRacingClub/ You'll get an idea of how big a day it has become and why a big day should have a big race card.
We often say how much the industry is driven by turnover at the expense of involvement and participation.
On the business side of it, the two pre midday races were $4500 events so there was a bit of business as usual from HRV whilst supporting the day.
The lady drivers, along with so many others, are rushing around getting involved with activities throughout the day so 25 min gaps on this day wouldn't be appropriate.