As legalized ways of gambling have almost come to a stop, horse racing remains the only sport still open for business. Despite that unique position, it hasn’t led to a surge in popularity or revenue to the few tracks still operating. ... Santa Anita gets about a third of its pari-mutuel business either on-track or through state inter-track wagering, sometimes called OTBs. However, the lack of other tracks running or no team sports to bet has shifted only about 10% to 20% of new revenue back to the mutuel handle.