Do you mean the person at the tracks taking odds or a business doing online bookmaking.

Being a bookie would be fun if you like maths, are street smart, somewhat not highly ethical but you are disciplined and can control your emotions. Similar to poker I guess. And are knowledgeable about the sport with respect to odds not trivia.

I doubt a typical gambler would enjoy it. Does a "foodie" love working in a lab testing flour samples?