You really ought to report him - he should be wearing a name badge, but, if he's not, demand he shows it to you. That sort of thing is not on, and I speak (well, type!) as part of raceday staff (at other courses). Any time you're solicited for a 'tip' to find a parking spot, unless you want to bribe your way in, that is, or find gatemen accepting 'thank yous' to allow people into where they shouldn't be, do report it to the racecourse office or the next nearest member of staff with a radio. It's not on and it only causes (as it has with you) bad feelings about the way the course is run. There are other considerations like safety numbers, if the practice is too rife, but that's not the point. You could always e-mail later, if you didn't want to be bothered on the day, of course, but direct action's always best.