Other things? This is their job. BITD is payed by the racers to organize and manage the race, which includes Scoring & Timing. The whole basis of this event is called a Race, and that race needs to be scored and times need to be kept to know who won? If this was NASCAR where everyone starts at the same time, then you would only need to count laps. But in an event where you start at different times, then your individual lap times are important. Remember in off-road racing you are racing the clock and in theory not your next competitor.
Also there were awards for fastest lap times in each class, so that could be another reason why its important to have lap times available, so those awards can be payed out.