I could Probably write a Book on the things that use to go on at the Track.....
So this question, could have Multiple Answers.
If you asked this question Back in the 80's & 90's, I could say that I have Witness some people make a Ton on Horse Gambling.
I myself was known to make a Very nice Buck on horse Racing...Back in the Day !
But in the Mid 2000's ( around 2006 ) things were not always the same.
New Trainers & Drivers came in, the "Boys" were already out of the picture
The new Drivers ( Kids ) had no fear....and really didn't care when they were told. Because they wanted to make a name for them selfs.
But back in the day, some Guys could make $50K+ a week betting Horses
Of course this was by Handicapping, but with Information !
You also have to remember, You didn't Need $50K to Make $50K in horse betting.
With Sports..( in Most cases ) You Do.
AAAHHHH, the Good Old Days ! are just about Gone.....