The only reason that comes to mind is lack of competitions to stimulate demand and get players trying out racing horse, otherwise most bookies I know/use do have race horsing from race courses coming from all over world and it's just the players not talking about this sport...I actually doubt it if this board as a thread dedicated to this sport too...

Perhaps this should be a challenge to our Sportsbooks on the forum to try make deliberate challenges to get horse racing on the sports map like we have football challenges all year round in the gambling section, then interest will be generated from this..