I have stats on 20,000 races .
That 30% is based on year end to year end.
Over every single race run.
The percentage does not alter by more than 1% ever since the 1950`s since records have been keept. inspite of all the wiz bang computer age , the stats refuse to be denied,

You can see why so many systems sold, revolve around the Fav.

For evey run of clustered wins , there will be a cluster of outs.
Regardless of track conditions.

The max No. of outs you should expect backing venue to venue (across the card) is 20 in a row.

The average POT (Profit on turnover) is -20%
Loss on turnover backing the Fav in the last race of any meeting is -5% , the strike rate is the same at 30%.

The winning percentage of Favs who had also won their previous start is 35%

Favs in hurdle races win 40%

And on & on ,I could go , so I will stop now ,before anyone starts developing a bubble on their head trying to take it all in at once.

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Cheers.