If I'm trying to gain points in NR2003, then most of the time I'll be
in pits with 30+ players. You rank goes based on average points won,
which in turn is based on the number of players you finish ahead of
(and behind). The more racers in a race, the more points you can win
(or lose). It's not that rare to have close to 40 players in a super
speedway race during prime time on NR2003.
However, this is not exactly a fair comparason. Run a road course
event in NR2003, and 20 players would be quite rare. Usually these
only involve 5 to 15 players.