The students themselves want to pitch badly because it's a once in a lifetime thing and it's so big of a deal in Japan.
Teams usually aren't full of scholarship students like the NCAA, so having a huge drop-off between the ace and the next best pitcher is pretty common.
You know, baseball is a sport where one big time ace pitcher can win you a tournament almost single-handedly, if he could pitch everyday.
Which is why everyone wants to be a pitcher in Japan, and the best talent usually goes to pitching.
Exceptions are like Ichiro, who was a pitcher but hurt his arm, and was forced to become an OF.