Bigger fields better and the stats prove it. The meetings with the highest turnover are mostly grass tracks. Why?
Harder to pick and you need to spend more money to cover the field with exotic bets and therefore the dividends are by default larger. More horses means possibly more moves in a race making them harder to predict.
Most punters I know have a bet to make money not throw it away. Hard to make money if the dividends are prohibitive to actually giving you a chance to make a profit. Lower number of horses in a race = lower dividends. Simple math.
That is why big fields on grass are all the rage in New Zealand. Everyone is trying to get a slice of those $20,000 first fours and $8000 trifectas. Not to mention the $20,000 quaddies.
We don't want the $20 trifectas and $50 first fours the fields at Cambridge are going to throw up tonight. Why risk your money for no reward. Once again the stats will prove it. No one will bet at this meeting the turnover will be proof of that.