Why horses, make it something more interesting.. dogs, rabbits or virtual pigeons.
We have the same thing, over and over again and it's
getting boring. You will also not attract any traffic if you cannot show proof that it is provably fair and that would be your biggest challenge.
I have a friend that does this for a living, and he says knowing the jockeys and the whole pedigree of the different horses makes it more
interesting for him. He is not gambling when he is betting on these horses, but rather applying his knowledge and experience. { according to
him }