Good reasons if all you with the car is go to the track Mon-Sun.
Every day Joe needs to drive it to work, shops and when going out... so gunning down in a 60 KM/H zone and controlling the gear changes is not valid here.
Auto car for daily chores and a bit of weekend fun, manual car for track and twisty mountains with no other cars present.
But as others have said, a drag strip will always dominate with autos.