Depends on the Template. In MOST cases, only $visitor (the viewing users data) is going to be exposed. $visitor.sportsbook_cash shows the viewing user THEIR Sportsbook cash. $user.sportsbook_cash will show the viewing user a specific users sportsbook cash (which is for places like the post bit on threads for specific users).
You are probably trying to user $user where the $user variable is not being exposed by the controller for the page OR you are using $user when you should be using $visitor.