Just a thought, as there is only 7 cars, while in Scooby-Doo, there are about 20 boats (at full capacity).
Scooby-Doo has not run that many boats in YEARS.
Actually, Scooby normally runs anywhere from 14-16 boats this year. If I remember correctly, at the beginning of this season, it started off with somewhere around 18-20 boats but has dwindled down to around 15 on average.